CURRICULUM VITALE

19 September 2018








Dr. Mohammad Reza Ay

Professor of Medical Physics,

Tehran University of Medical Sciences

Email: mohammadreza_ay@tums.ac.ir


Biography

I am professor at Tehran University of Medical Sciences, Faculty of Medicine, Department of Medical Physics. My main research field is Molecular and Cellular Imaging.

Date of Birth: 22/03/1972

Nationality: Iranian

Marital Status: Married

Email: mohammadreza_ay@tums.ac.ir






Academic Background

1990 - 1995  B.Sc. Degree in Electronic Engineering
Faculty of Electrical Engineering, Shiraz University School of Engineering – Shiraz - Iran
Thesis: "Design and Implementation of a Random Number Generator (RNG) for Cryptography", Supervisor: M. Masnadi (Shiraz University), H. Vazifedoust (Sagem Representative in Iran: SAIRAN). Garde: 20/20

1996 - 1998  M.Sc. Degree in Medical Radiation
Faculty of Physics, Tehran Polytechnic University - Tehran - Iran
Thesis: "3D Monte Carlo Simulation of Coincidence Systems", Supervisors: Dr. ME.H. Ashrafi (Surry University, UK), Dr. H. Afarideh (Atomic Energy organization of Iran). Grade: 19.5/20

1999 - 2004  Ph.D. Degree in Medical Radiation
Faculty of Physics, Tehran Polytechnic University, Tehran, Iran
Thesis: "Monte Carlo Modeling of x-ray Computed Tomography: Application in the Assessment of CT-Based Attenuation Correction in PET/CT systems", Supervisors: Dr. S. Sarkar (Tehran University), Dr. S. Sardari (Polytechnic University), Dr. H. Zaidi (Geneva University). Advisor: Dr. M. Shahriari (Shahid Beheshti University). Grade: Excellent

2003 - 2006  Ph.D. Degree in Medical Physics
Faculty of Science, Geneva University, Geneva, Switzerland
Thesis: "Monte Carlo and Experimental Assessment of CT-Based Attenuation Correction in PET", Supervisor: PD Dr. H. Zaidi (Geneva University), Advisor: Pr. Sviatoslav Voloshynovskiy (Geneva University). Grade: Excellent

Positions

 . Director of National Brain Mapping Lab, Ministry of Science and Technology and Ministry to Health 

 . Member of Technology Committee, Tehran University of Medical Sciences, Tehran, Iran 

 . Head of Department of Medical Physics and Biomedical Engineering, Tehran University of Medical Sciences 

 . Head of Research Center for Molecular and Cellular Imaging, Institute for Advanced Medical Technologies, Tehran University of Medical Sciences 

 . Editor in Chief, Frontiers in Biomedical Technology, the official scientific quarterly publication of the Institute of Medical Technologies, Tehran University of Medical Sciences 

 . Senior Researcher, PET Instrumentation and Neuroscience Lab, Geneva University Hospital, Switzerland 

 . CEO and Founder of Parto Neghar Persia Co. a Knowledge Based Company 

 . Radiation Safety Officer, Imam Khomeini Hospital Complex, Tehran University of Medical Sciences 

 . Medical Physicist, PET/CT and Cyclotron Center, Research Institute for Nuclear Medicine, Shariati Hospital, till 2013 

 . Deputy of Education, Department of Medical Physics and Biomedical Engineering, Tehran University of Medical Sciences, till 2012 

 . Head Medical Imaging Research Groups, Research Center for Molecular and Cellular Imaging , Tehran University of Medical Sciences 

 . Deputy of International Affairs, Research Center for Science and Technology in Medicine, Tehran University of Medical Sciences 

 . Editor in Chief, Frontiers in Biomedical Technology the official scientific quarterly publication of the Institute of Medical Technologies, Tehran University of Medical Sciences 

Academic Honors

2016, The recipient of a 2016 second rank on Innovators and Inventors
20th Razi International Festival in Medical Sciences, Tehran, February, 2016

2014, The recipient of a 2014 Applied Researches Award
27th Khwarizmi International Festival, Tehran, March, 2014

2014, The recipient of a 2014 Jorjani Award (Educational Excellence at the University)
15th Avesina Festival, Tehran, March, 2014

2013, The recipient of a 2013 first rank on Innovators and Inventors
18th Razi International Festival in Medical Sciences, Tehran, February, 2013

2008, Foundation of National Genius, Iran
The recipient of Research Grant for young Investigator

2007, International Union Against Cancer
The recipient of the ICRETT Transfer Technology Grant No. ICR/07/160 / 2007

2006, The recipient of a 2006 IEEE MIC Trainee Award
IEEE Nuclear Science Symposium and Medical Imaging Conference, San Diego, California, October 29 –November 4, 2006

2006, The recipient of a 2006 Young Investigator Award
12th Razi International Festival in Medical Sciences, Tehran, December 12, 2006

2003, Geneva University, Switzerland
Achieving the Swiss National Science Foundation grant SNSF 3152A0-102143 for PhD program in Geneva University

1998, Tehran Polytechnic University, Iran
Achieving first position in admission exam entering PhD program in Polytechnic University

1997, Tehran Polytechnic University, Iran
Named as Top student among Nuclear Engineering M.S. students

1996, Tehran Polytechnic University, Iran
Achieving second position in admission exam entering M.S. degree program in IRAN i.e. 2nd among 7500 participants


Journal Editorial

Editor in Chief, Frontiers in Biomedical Technology the official scientific quarterly publication of the Institute of Medical Technologies, Tehran University of Medical Sciences

Member of the Editorial Board, Asia Oceania Journal of Nuclear Medicine & Biology

Member of the Editorial Board, The Open Journal of Medical Imaging

Member of the Editorial Board, Iranian Journal of Nuclear Medicine

International and National Patent

US Patent, 2016, Pub. No. US 2016/0220204 A1, Robotic System for Cardiac Imaging", Provisional Patent

US Patent, 2016, Pub. No. US 2016/0116604 A1 Desktop Open-Gantry SPECT Imaging System Using Tilted Detector

US Patent, 2013, Pub. No. US 8,503,748 B2, Non Linear Recursive Filter for Medical Image Processing

Iran Patent 2013/80617, Adjustable FOV for Rat and Mice Imaging In HiReSPECT Scanner

Iran Patent 2013/80821, A Filter for Processing of High Count Rate Detectors

Iran Patent 2013/82892, Resolution Recovery Reconstruction in Animal SPECT System

•US Patent, 2017, No. US 62/429,763 " AUTOMATIC 2D PEAK DETECTION FOR CALIBRATION OF GAMMA DETECTOR BLOCK IMAGES"

•US Patent, 2017, No. US 62/435,877 " A Novel Method for Reduction of Positron Range in High-Resolution PET Imagingr"

Developed Imaging and Measurement Systems

High Resolution Animal SPECT Imaging System (HiReSPECT)

Infra Operative Gamma Camera (SurgoSight)

Gamma Probe (SurgeoGuide)

Urea Breath Test System, UBT (HeliGuide)

Dedicated Cardiac SPECT Imaging System (RoboSPECT)


Publications:

Book Chapters

1- M.R. Ay and N. Ghazanfari "Hybrid Imaging, PET/CT, in HANDBOOK OF SMALL ANIMAL IMAGING, Preclinical Imaging, Therapy, and Applications", George C. Kagadis et al. , Editors. 2016, Tylor & Francis Books, Inc.

2- M.R. Ay and P. Geramifar "Positron Emission Tomography: Physics, Instrumentation, Scanners and New Horizons", 2014, Royan Pazhoh, Inc., Tehran, Iran, ISBN-13: 9786007108543

3- M.R. Ay and H. Zaidi "Analytical and Monte Carlo modeling of x-ray spectra in mammography, in Emerging Technologies in Breast Imaging and Mammography", J.S. Suri, R.M. Rangayyan, and S. Laxminarayan, Editors. 2006, American Scientific Publishers: Valencia, CA. ISBN: 1-58883-090-X, 2006, pp 25-44

4- M.R. Ay "Cyclotrons in nuclear medicine, in Comprehensive book on Radiology, Nuclear Medicine and Therapy Systems", J. Shokohi, A.A. Ameri, and H.R. Sagha, Editors. 2003, Andishe Rafi Publisher: Tehran, Iran. pp. 1742-1756

5- M.R. Ay "Introduction to PET and PET/CT systems, in Comprehensive book on Radiology, Nuclear Medicine and Therapy Systems", J. Shokohi, A.A. Ameri, and H.R. Sagha, Editors. 2003, Andishe Rafi Publisher: Tehran, Iran. pp. 1757-1781

Peer-reviewed Journal Publications

1- Sara Khademi, Saeed Sarkar, Ali Shakeri-Zadeh, Neda Attaran, Sharmin Kharrazi, Mohammad Reza Ay, Hossein Ghadiri "Folic acid-cysteamine modified gold nanoparticle as a nanoprobe for targeted computed tomography imaging of cancer cells", Materials Science and Engineering: C,2018 ,Vol.89

2- Behnoosh Teimourian Fard, Mojtaba Shamsaei Zafarghandi, Soheil Hosseini, Hamid Sabet, Mohammad Reza Ay "An alternative mathematical modeling of the scintillation camera and framework for performance analysis of gamma-ray positioning algorithms", Iranian Journal of Nuclear Medicine, 2018, v.26, P.112-126

3- Ali Ketabi, Pardis Ghafarian, Mohammad Amin Mosleh-Shirazi, Seyed Rabi Mahdavi, Mohammad Reza Ay "The influence of using different reconstruction algorithms on sensitivity of quantitative 18F-FDG-PET volumetric measures to background activity variation", Iranian Journal of Nuclear Medicine, 2018, Vol.26, pp 87-97

4- Hamidreza Hemmati, Alireza Kamali-Asl, Pardis Ghafarian, Mohammad Reza Ay "Reconstruction/segmentation of attenuation map in TOF-PET based on mixture models", Annals of nuclear medicine, 2018, Vol.26, pp 1-11

5- H Hemmati, A Kamali-Asl, P Ghafarian, MR Ay "Mixture model based joint-MAP reconstruction of attenuation and activity maps in TOF-PET", Journal of Instrumentation, 2018, Vol.13

6- Narges Salehi, Arman Rahmim, Emad Fatemizadeh, Afshin Akbarzadeh, Mohammad Hossein Farahani, Saeed Farzanefar, Mohammad Reza Ay "Cardiac contraction motion compensation in gated myocardial perfusion SPECT: A comparative studyRobotic system for SPECT imaging", Physica Medica, 2018, Vol.49, pp 77-82

7- Salar Sajedi, Navid Zeraatkar, Mohsen Taheri, Sanaz Kaviani, Hadi Khanmohammadi, Saeed Sarkar, Hamid Sabet, Mohammad Reza Ay "Generic high resolution PET detector block using 12× 12 SiPM array", Biomedical Physics & Engineering Express, 2018, Vol 4

8- A Emami, H Ghadiri, A Rahmim, MR Ay "A novel dual energy method for enhanced quantitative computed tomography", Journal of Instrumentation, 2018, Vol.13

9- Sara Khademi, Saeed Sarkar, Sharmin Kharrazi, Seyed Mohammad Amini, Ali Shakeri-Zadeh, Mohammad Reza Ay, Hossein Ghadiri "Evaluation of size, morphology, concentration, and surface effect of gold nanoparticles on X-ray attenuation in computed tomography", Physica Medica, 2018, Vol 45,pp 127-133

10- Zahra Etemadi, Pardis Ghafarian, Ahmad Bitarafan-Rajabi, Hadi Malek, Mohammad Reza Ay "Is correction for metallic artefacts mandatory in cardiac SPECT/CT imaging in the presence of pacemaker and implantable cardioverter defibrillator leads?", Iranian Journal of Nuclear Medicine

11- Fatemeh Sadat Fatemi Nasrollahi, Pardis Ghafarian, Parham Grramifar, Mohammad Reza Ay "Quantification and Reduction of Respiratory Induced Artifact in Attenuation Correction of PET Data using Respiration Averaged CT: A Simulation and Phantom Study", Frontiers in Biomedical Technologies, 2017, Vol 3, pp 49-59

12- Roya Sharifpour, Pardis Ghafarian, Arman Rahmim, Mohammad R Ay "Quantification and reduction of respiratory induced artifacts in positron emission tomography/computed tomography using the time-of-flight technique", Nuclear medicine communications

13- Somayeh Gholami, Hassan Ali Nedaie, Francesco Longo, Mohammad Reza Ay, Sharifeh A Dini, Ali S Meigooni "Grid block design based on monte carlo simulated dosimetry, the linear quadratic and Hug–Kellerer radiobiological models", Journal of medical physics, 2017, Vol 42, pp 213

14- Hamidreza Hemmati, Alireza Kamali-Asl, Mohammadreza Ay, Pardis Ghafarian "Compton scatter tomography in TOF-PET", Physics in Medicine & Biology,2017, Vol 62, pp 7641

15- N Zeraatkar, S Sajedi, B Teimourian Fard, S Kaviani, A Akbarzadeh, MH Farahani, S Sarkar, MR Ay "Development and calibration of a new gamma camera detector using large square Photomultiplier Tubes", Journal of Instrumentation,2017, Vol 12

16- Peyman Sheikhzadeh, Hamid Sabet, Hossein Ghadiri, Parham Geramifar, Hojjat Mahani, Pardis Ghafarian, Mohammad Reza Ay "Development and validation of an accurate GATE model for NeuroPET scanner", Physica Medica, 2017,Vol.40, pp59-65

17- Hojjat Mahani, Gholamreza Raisali, Alireza Kamali-Asl, Mohammad Reza Ay "Spinning slithole collimation for high-sensitivity small animal SPECT: Design and assessment using GATE simulation", Physica Medica, 2017, Vol 40, pp 42-50

18- Shabnam Khorasani Gerdekoohi, Naser Vosoughi, Kaveh Tanha, Majid Assadi, Pardis Ghafarian, Arman Rahmim, Mohammad Reza Ay "Implementation of absolute quantification in small‐animal SPECT imaging: Phantom and animal studies", Journal of applied clinical medical physics, 2017, Vol 18, pp 215-223

19- Hojjat Mahani, Gholamreza Raisali, Alireza Kamali-Asl, Mohammad Reza Ay "How crystal configuration affects the position detection accuracy in pixelated molecular SPECT imaging systems?", Nuclear Science and Techniques, 2017, Vol 28, pp 47

20- Shabnam Khorasani Gerdekoohi, Naser Vosoughi, Kaveh Tanha, Majid Assadi, Pardis Ghafarian, Arman Rahmim, Mohammad Reza Ay "Implementation of absolute quantification in small-animal SPECT imaging: Phantom and animal studies", MEDICAL IMAGING, 2017, pp 1-9

21- S Zargan, P Ghafarian, A Shabestani Monfared, AA Sharafi, M Bakhshayeshkaram, MR Ay "Evaluation of radiation exposure to staff and environment dose from [18F]-FDG in PET/CT and cyclotron center using thermoluminescent dosimetry", Journal of biomedical physics & engineering, 2017,Vol 7

22- M Shekari, P Ghafarian, S Ahangari, MR Ay "Quantification of the impact of TOF and PSF on PET images using the noise-matching concept: clinical and phantom study", Nuclear Science and Techniques, 2017, Vol 28, pp 167

23- Hojjat Mahani, Gholamreza Raisali, Alireza Kamali-Asl, Mohammad Reza Ay "Collimator-Detector Response Compensation in Molecular SPECT Reconstruction using STIR Framework?", Iranian Journal of Nuclear Medicine and Molecular Imaging, 2017, Vol 25, pp 26-34

24- Roya Sharifpour, Pardis Ghafarian, Mehrdad Bakhshayesh-Karam, Hamidreza Jamaati, Mohammad Reza Ay "Impact of Time-of-Flight and Point-Spread-Function for Respiratory Artifact Reduction in PET/CT Imaging: Focus on Standardized Uptake Value", Tanaffos ,2017,Vol 16, pp 127

25- Hojjat Mahani, Gholamreza Raisali, Alireza Kamali-Asl, Mohammad Reza Ay "Monte Carlo optimization of crystal configuration for pixelated molecular SPECT scanners", Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2017, Vol 844, pp 1-6

26- Anahita Fathi Kazerooni, Mohammad Reza Ay, Saman Arfaie, Parisa Khateri, Hamidreza Saligheh Rad "Single STE-MR Acquisition in MR-Based Attenuation Correction of Brain PET Imaging Employing a Fully Automated and Reproducible Level-Set Segmentation Approach", Molecular Imaging & Biology, 2017, Vol 19, pp 143-152

27- P. Ghobadi, A. Ahmadian, H. saberi, M.R. Ay, M. Addolghafar and K. Amini "A hybrid tracking system for image-guided spine surgery using a tracked mobile C-arm: a phantom study ", Turk J Elec Eng & Comp Sci, 2017, Vol. 25, pp 434-448.

28- Navid Zeraatkar, Arman Rahmim, Saeed Sarkar, Mohammad Reza Ay "Development and Evaluation of Image Reconstruction Algorithms for a Novel Desktop SPECT System", Asia Oceania Journal of Nuclear Medicine and Biology,2017, Vol 5,pp 120

29- Afshin Akbarzadeh, Valiallah Saba, Mohammad Reza Ay "New approach for calibration of pixelated scintillation detectors of intraoperative gamma cameras", Iranian Journal of Nuclear Medicine and Molecular Imaging, 2017, Vol. 25, No. 1, pp 34-42.

30- M. Shandiz, H. Saligeh Rad, P. Ghafarian, M. Bakhshaysh Karam and M.R. Ay "MR-guided attenuation map for prostate PET-MRI: an intensity and morphologic-based segmentation approach for generating a five-class attenuation map in pelvic region", Ann Nucl Med. 2017, Vol 31, pp 29-39

31- S. Kaviani, N. Zeraatkar,S. Sajedi, N. Gorjizadeh, M.H. Farahani, P. Ghafarian,G. El Fakhri, H. Sabete and M.R. Ay "Development and characterization of a compact hand-held gamma probe system, SURGEOGUIDE, based on NEMA NU3-2004 standards", Journal of Instrumentation, 2016, Vol 11

32- S. Kaviani, N. Zeraatkar, S. Sajedi, A. Akbarzadeh, N. Gorjizadeh, M. H. Farahani, B. Teimourian, P. Ghafarian, H. Sabet and M.R. Ay "Design and development of a dedicated portable gamma camera system for intra-operative imaging", Phys Med. 2016 Jul;32(7):889-97. doi: 10.1016/j.ejmp.2016.06.004. Epub 2016 Jun 23

33- N. Zeraatkar, M. H. Farahani, S. Sarkar, A. Rahmim and M.R. Ay "Design and Assessment of a Novel SPECT System for Desktop Open-Gantry Imaging of Small Animals: a Monte Carlo Study", Med Phys. 2016 May;43(5):2581. doi: 10.1118/1.4947127

34- S. Gholami, H. Nedaie, F. Longo, M. R. Ay, S. Wright and A. S. Meigooni "Is Grid Therapy Useful for all Tumors and Every Grid Block Design?", J Appl Clin Med Phys. 2016 Mar 8;17(2):6015

35- Aram Radnia, MohammadHossein Farahani, C Hoorvash, MohammadReza Ay "Introducing the HeliGuide: Urea Breath Tests System for Detecting Helicobacter Pylori", Frontiers in Biomedical Technologies,2015, Vol 2,pp 115-117

36- Hojjat Mahani, Alireza Kamali-Asl, MohammadReza Ay "How gamma camera’s head-tilts affect image quality of a nuclear scintigram?", Frontiers in Biomedical Technologies, 2015, Vol 1

37- Pardis Ghafarian, MohammadReza Ay "The influence of PET and CT misalignment due to respiratory motion on the cardiac PET/CT imaging: a simulation study", Frontiers in Biomedical Technologies,2015, Vol 1

38- P. Khateri, H. Saligheh Rad, A. H. Jafari, A. Fathi Kazerooni, A. Akbarzadeh, M. Shojae Moghadam, A. Aryan, P. Ghafarian, M. R. Ay "Generation of a Four-Class Attenuation Map for MRI-Based Attenuation Correction of PET Data in the Head Area Using a Novel Combination of STE/Dixon-MRI and FCM Clustering", Mol Imaging Biol. 2015 Dec;17(6):884-92. doi: 10.1007/s11307-015-0849-1

39- M. Zabihzadeh, S.R. Mahdavi, M.R. Ay and Z. Shakarami "Monte Carlo Calculation of Neutron Doses to Organs of a Female Undergoing A Pelvic 18 MV Irradiation", Biomedical & Pharmacology Journal, 2015, Vol. 8, pp 65-71

40- H. Arabi, A.R. Kamali Asl, M. R. Ay and H. Zaidi "Monte Carlo-based Assessment of the Trade-off between Spatial Resolution, Field-of-View and Scattered Radiation in the Variable Resolution X-ray CT Scanner", Phys Med, 2015, Vol. 31, pp 510-516

41- M. Shekari, P. Ghafarian, S. Ahangari, H. Ghadiri, M. Bakhshayeshkaram and M.R. Ay "Optimizing Image Reconstruction Parameters in Time of Flight PET/CT Imaging: a Phantom Study", 2015, Vol. 2, No. 3, pp 146-154

42- M. Zabihzadeh, S.R. Mahdavi, M.R. Ay and Z. Shakarami "The Effects of Backscattered Radiation into Beam Monitor Chamber: Study of 6 and 18 MV Conventional and Removed Flattening Filter Clinical Accelerator", BIOSCIENCES BIOTECHNOLOGY RESEARCH ASIA, 2015, Vol. 12, pp 25-36

43- S. Ahangari, P. Ghafarian, M. Shekari, H. Ghadiri, M. Bakhshayeshkaram and M.R. Ay "The Impact of Point Spread Function Modeling on Scan Duration in PET Imaging", Frontiers in Biomedical Technologies, 2015, Vol. 2, No. 3, pp 137-145

44- P. Khateri, H. Saligeh Rad, A.H. Jafari and M.R. Ay "A Novel Segmentation Approach for Implementation of MRAC in Head PET/MRI Employing Short-TE MRI and 2-Point Dixon Method in a Fuzzy C-Means Framework", Nuclear Instrumentation Methods in Physics Research A, 2014, Vol. 734, No. 8, pp 171-174

45- M. R. Ay, A. Akbarzadeh, A. Ahmadian and H. Zaidi "Classification of bones from MR images in torso PET-MR imaging using a statistical shape model", Nuclear. Instrumentation Methods in Physics Research A, 2014, Vol. 734, pp 196-200

46- H. Ghadiri, MB Shiran, HR Soltanian-Zadeh, A. Rahmim, H. Zaidi and M.R. Ay "Derivation of attenuation map for attenuation correction of PET data in the presence of nanoparticulate contrast agents using spectral CT imaging", Annals of Nuclear Medicine, 2014, Vol. 28, No. 6, pp 559-570

47- S. Sajedi , N. Zeraatkar, V. Moji, M. H. Farahani, S. Sarkar, H. Arabi, B. Teymoorian, P. Ghafarian, A. Rahmim and M.R. Ay "Design and Development of a High Resolution Animal SPECT Scanner Dedicated for Rat and Mouse Imaging", Nuclear. Instrumentation Methods in Physics Research A, 2014, Vol. 741, pp 169-176

48- A. M. Pashazadeh, K. Tanha, F. Jafarian Dehkordi, M. Assadi, V. Moji , N. Zeraatkar and M.R. Ay "Experimental Evaluation of the Performance of HiReSPECT Scanner: a High-Resolution SPECT System for Small Animal Imaging", Frontiers in Biomedical Technologies, 2014, Vol. 1, No. 3, pp 222-227

49- H. Mahani, A. Kamali-Asl, M.R. Ay "How Gamma Camera’s Head-Tilts Affect Image Quality of a Nuclear Scintigram?", Frontiers in Biomedical Technologies, 2014, Vol. 1, No. 4, pp 265-270

50- V. Moji, N. Zeraatkar, M.H. Farahani, M. Aghamiri, S. Sajedi, B. Teymorian, P. Ghafarian , S. Sarkar and M.R. Ay "Performance Evaluation of Newly Developed High Resolution Dual Head Animal SPECT System Based on NEMA NU2 2007 Standard", J Appl Clin Med Phys, 2014, Vol. 15, No. 6, pp 267-278

51- P. Ghafarian, M.R. Ay, A. Fard-Esfahani, A. Rahmim and H. Zaidi "Quantification of PET and CT misalignment errors due to bulk motion in cardiac PET/CT imaging: Phantom and clinical studies", Frontiers in Biomedical Technologies, 2014, Vol. 1, No. 3, pp 159-167

52- N. Zeraatkar, S. Sajedi, M. H. Farahani, H. Arabi, S. Sarkar, P. Ghafarian, A. Rahmim and M.R. Ay "Resolution-Recovery-Embedded Image Reconstruction for a High-Resolution Animal SPECT System", Phys Med, 2014, Vol. 30, No. 7, pp 774-781

53- P. Ghafarian, M.R. Ay "The Influence of PET and CT Misalignment due to Respiratory Motion on the Cardiac PET/CT Imaging: a Simulation Study", Frontiers in Biomedical Technologies, 2014, Vol. 1, No. 4, pp 252-257

54- H Ghadiri, M. R. Ay , M. B. Shiran, H. R. Soltanian-Zadeh and H Zaidi "K-edge ratio method for identification of multiple nanoparticulate contrast agents by spectral CT imaging", Br J Radiol. 2013 Sep; 86(1029): 20130308

55- A. Mehranian, M. R. Ay, A. Rahmim and H. Zaidi "3D Prior Image Constrained Projection Completion for X-ray CT Metal Artifact Reduction", IEEE Trans Nuclear Sciences, 2013, Vol. 60, No. 5, pp 3318-3332

56- S. Sajedi, A. Kamali Asl, M. R. Ay, M.H. Farahani and A. Rahmim "A novel non-linear recursive filter design for extracting high rate pulse features in nuclear medicine imaging and spectroscopy", Medical Engineers & Physics , 2013, Vol. 35, No.6, pp. 754-764

57- A. Mehranian, A. Rahmim, M. R. Ay, F. Kotasidis and H. Zaidi "An ordered-subsets proximal preconditioned gradient algorithm for edge-preserving PET image reconstruction", Medical Physics 2013, Vol. 40, No. 5, pp 052503-14

58- S. Vaezzadeh, M. Allahverdi, H. Nedaei, M. R. Ay, A. Shirazi and M. Yarahmadi "EBT GHAFCROMIC film dosimetry in compensator-based intensity modulation radiation therapy", Medical Dosimetry , 2013, Vol. 38, pp. 176-183

59- A. Akbarzadeh, D. Gutierrez, A. Baskin, M. R. Ay, A. Ahmadian, N. Riahi Alam, K. Lövblad and H. Zaidi "Evaluation of whole-body MR to CT deformable image registration", J Appl Clin Med Phys, 2013, Vol. 14, No. 4, pp 238-253

60- M. R. Ay, A. Mehranian, A. Maleki, H. Ghadiri,P. Ghafarian and H. Zaidi "Experimental assessment of the influence of beam hardening filters on image quality and patient dose in volumetric 64-slice x-ray CT scanners", Phys Med , 2013, Vol. 29, pp. 249-260

61- A. Akbarzadeh, M. R. Ay, A. Ahmadian, N. Riahi Alam and H. Zaidi "MRI-guided attenuation correction in whole-body PET/MR: Assessment of the effect of bone attenuation", Annals of Nuclear Medicine, 2013, Vol. 27, pp. 152-162

62- P. Geramifar, M. Shamsaie Zafarghandi, P. Ghafarian, A. Rahmim and M. R. Ay "Respiratory-Induced Errors in Tumor Quantification and Delineation in CT Attenuation Corrected PET Images: Effects of Tumor Size, Tumor Location and Respiratory Trace - A Simulation Study Using the 4D XCAT Phantom", Molecular Imaging & Biology, 2013, Vol. 15, No. 6, pp 655-665

63- A. Mehranian, H. Salighe Rad, A. Rahmim, M. R. Ay and H. Zaidi "Smoothly Clipped Absolute Deviation (SCAD) Regularization for Compressed Sensing MRI Using an Augmented Lagrangian Scheme", Magnetic Resonance Imaging, 2013, Vol. 31, No. 8, pp 1399-1411

64- A. Mehranian, M. R. Ay, A. Rahmim and H. Zaidi "X-ray CT metal artifact reduction using wavelet domain L0 sparse regularization", IEEE Trans Med Imaging, 2013, Vol. 32, No. 9, pp 1707-1722

65- E. Saeedzadeh, S. Sarkar, A. Abbaspour Tehrani-Fard, M.R. Ay, H.R. Khosravi, G. Loudos "3D Calculation of Absorbed Dose for 131I Targeted Radiotherapy: A Monte Carlo Study", Radiation Protection Dosimetry, 2012, 150, pp. 298-305

66- B. Teimourian , M. R. Ay, M. Shamsaei-Zafarghandi, P. Ghafarian, H. Ghadiri and H. Zaidi "A novel energy mapping approach for CT-based attenuation correction in PET", Med Phys 2012, Vol. 39, No. 4, pp 2078-2089

67- P. Khateri, H. Saligeh Rad, A, Fathi and M.R. Ay "Generation of attenuation map for MR-based attenuation correction of PET data in the head area employing 3D short echo time MR imaging", Nuclear. Instrumentation Methods in Physics Research A, 2012, Vol. 702, No.21, pp. 133-136

68- M.A. Habibzadeh, M.R. Ay, A.R. Kamali Asl, H. Ghadiri and H. Zaidi H "Impact of miscentering on patient dose and image noise in x-ray CT imaging: Phantom and clinical studies", Phys Med Vol. 28, 2012, pp. 191-199

69- N. Ghazanfari, S. Sarkar, G. Loudos, M.R. Ay "Quantitative assessment of the influence of crystal material and size on the performance of rotating dual head small animal PET scanners: Monte Carlo modeling", Hellenic Journal of Nuclear Medicine, 2012, Vol. 15, No. 1, pp. 33-39

70- F. Kalantari, H. Rajabi, M. R. Ay, A. Fard Esfahani, M. Eftekhari, B. Fallahi, A. Emami Ardekani "The infuence of resolution recovery by using collimator detector response during 3D OSEM image reconstruction on 99mTc-ECD brain SPET images", Hellenic Journal of Nuclear Medicine, 2012, Vol. 15, No. 2, pp. 91-96

71- N. Zeratkar, M.R. Ay, A Kamaliasl and H. Zaidi "Accurate Monte Carlo modeling and performance assessment of the X-PET™ subsystem of the FLEX Triumph™ preclinical PET/CT scanner", Medical Physics, 2011, Vol. 38, No 3, pp 1217-1225

72- F. Vedaei, A. Kamali asl, F. Kalantari, M. Ansari, M.R. Ay "Assessment of the impact of applying attenuation correction on the accuracy of activity recovery in Tc99m-ECD brain SPECT of healthy subject using Statistical Parametric Mapping (SPM)", Iranian Journal of Nuclear Medicine, 2011, 19, pp. 52-59

73- M. R. Ay, M. Shirmohammad, S. Sarkar, A. Rahmim, H. Zaidi "Comparative assessment of energy-mapping approaches in CT-based attenuation correction for PET", Molecular Imaging & Biology, 2011, Vol. 13, pp. 187-198

74- R. Prasad, M.R. Ay, O. Ratib and H. Zaidi "CT-based attenuation correction on the FLEX Triumph™ preclinical PET/CT scanner", IEEE Trans Nuclear Sciences, 2011, Vol. 58 pp 66-75

75- P. Geramifar, M.R. Ay, M. Shamsaie Zafarghandi, S. Sarkar, G. Loudos, A. Rahmim "Investigation of Time-of-Flight Benefits on the LYSO-Based PET/CT Scanner: A Monte Carlo Study Using GATE", Nuclear. Instrumentation Methods in Physics Research A , 2011 Vol. 641, pp. 121-127

76- P. Ghafarian, S.M.R. Aghamiri, M.R. Ay, A. Rahmim, T. Schindler, O. Ratib and H. Zaidi "Is Metal Artifact Reduction Mandatory in Cardiac PET/CT Imaging in the Presence of Pacemaker and Implantable Cardioverter Defibrillator leads?", European Journal of Nuclear Medicine and Molecular Imaging, 2011, Vol. 38, No. 2, pp 252-262

77- M. Allahverdi, M. Zabih Zadeh, M.R. Ay, S.R. Mahdavi, M. Shahriari ,A. Mesbahi and H. Alijanzadeh "Monte Carlo estimation of electron contamination in a 18MV clinical photon beam", Iranian Journal of Radiation Research, 2011, Vol. 9 pp 15-28

78- N. Zeraatkar, M. R. Ay, P. Ghafarian, S. Sarkar, P. Geramifar, and A. Rahmim "Monte Carlo-based evaluation of inter-crystal scatter and penetration in the PET subsystem of three GE Discovery PET/CT scanners", Nuclear. Instrumentation Methods in Physics Research A, 2011, Vol. 659, pp. 508-514

79- H. Arabi, A Kamaliasl, M.R. Ay and H. Zaidi "Novel detector design for reducing inter-cell x-ray cross-talk in the variable resolution x-ray CT scanner: A Monte Carlo study", Medical Physics, 2011, Vol. 30 pp. 1389-1396

80- M.R. Ay, A. Mehranian, M. Abdoli, P. Ghafarian and H. Zaidi "Qualitative and quantitative assessment of metal artefacts arising from implantable cardiac pacing devices in oncological PET/CT studies: A phantom study", Molecular Imaging & Biology, 2011, Vol. 13, pp. 1077-1088

81- A. Akbarzadeh, M.R. Ay ,H. Ghadiri, S.Sarkar "A new method for experimental characterization of scattered radiation in 64-slice CT scanner", Biomedical Imaging and Intervention Journal, 2010, 6(1):e3

82- M. Abdoli, M.R. Ay, A. Ahmadian and H. Zaidi "A Virtual Sinogram Method to Reduce Dental Metallic Implant Artefacts in CT-based Attenuation Correction for PET", Nuclear Medicine Communication, 2010, 31, 22-31

83- A. Akbarzadeh, M.R.Ay ,H.Ghadiri, S.Sarkar "Calculation Of Scattered Radiation Profile In 64 Slice CT Scanners Using Experimental Measurement", Iran J. Medical Physics , 2010, 6, 1-10

84- P. Ghafarian, S.M.R. Aghamiri, M.R. Ay, B. Fallahi, A. Rahmim, T. Schindler, O. Ratib and H. Zaidi "Coronary calcium score scan-based attenuation correction in cardiovascular PET imaging", Nuclear Medicine Communication, 2010, Vol. 31, No 9, pp 780-787

85- M. Rasouli, A. Takavar, M.R. Ay, S. Saber, and G. Loudos "Effects of Crystal Pixel Size and Collimator Geometry on the Performance of a Pixelated Crystal Gamma Camera Using Monte Carlo Simulation", Journal of Nuclear Medicine Technology, 2010, Vol. 38, No 4, pp 199-204

86- L. Karimi-Afshar, N. Riahi Alam, M.R.Ay, M. Allahverdi, T. Purfallah, H. Hashemi, A. Farahani, B. Efie, M. Bakhteiari "Evaluation of MRI-based Polymer Gel Dosimetry for Measurement of CT Dose Index (CTDI) on 64 slices CT Scanners", Iran J. Medical Physics , 2010, 6, 59-70

87- A. Akbarzadeh, M. R. Ay, H. Ghadiri, S. Sarkar and H. Zaidi "Measurement of scattered radiation in a volumetric 64-slice CT scanner using three experimental techniques", Physics Medicine and Biology, 2010, 55, 2269-2280

88- A. Mehranian, M.R. Ay, N. Riahi and H. Zaidi "Quantifying the effect of anode surface roughness on diagnostic x-ray spectra using Monte Carlo simulation", Medical Physics, 2010, 37, 742-752

89- M. Abdoli, M.R. Ay, A. Ahmadian, A. J. O. Dierckx and H. Zaidi "Reduction of dental filling metallic artefacts in CT-based attenuation correction of PET data using weighted virtual sinograms optimized by a genetic algorithm", Medical Physics, 2010, Vol. 37, No 12, pp 6166-6177

90- B. Teymoorian, M.R. Ay, M. Shamsaei Zafarghandi and H. Ghadiri "A Novel Dual Energy CT-Based Attenuation Correction Method in PET/CT Systems: A Phantom Study", " Iranian Journal of Nuclear Medicine, 2009, 17, 42-49

91- T. Allahverdi, M. Allahverdi, N. Riahi Alam, M.R. Ay, M. Zahmatkesh "Differential Dose Volume Histograms of Gamma Knife in Presence of Inhomogeneities Using MRI- polymer Gel Dosimetry and MC Simulation", Medical Physics, 2009, 36,3002-3012

92- T. Allahverdi, M. Allahverdi, N. Riahi Alam, M.R. Ay, M. Zahmatkesh "Evaluation of Dose Delivery Accuracy of Gamma Knife Using MRI Polymer Gel Dosimeter in an Inhomogeneous Phantom", Journal of Physics: Conference Series 164, 2009, doi:10.1088/1742-6596/164/1/012066

93- M. Zabih Zadeh, M.R. Ay, M. Allahverdi, A. Mesbahi, S.R. Mahdavi and M. Shahriari "Monte Carlo Estimation of Photoneotrons Contamination from High Energy Medical Accelerator in Threatment Room and Maze: A Simplified Model", Radiation Detection Dosimetry, 2009, 135, 21-32

94- P. Geramifar, M.R. Ay, M. Shamsaie Zafarghandi,G. Loudos, A. Rahmim "Performance Comparison of Four Commercial GE Discovery PET/CT Scanners: A Monte Carlo Study Using GATE", Iranian Journal of Nuclear Medicine, 2009, 17, 26-33

95- T. Allahverdi, M. Allahverdi, N. Riahi Alam, M.R. Ay, M. Zahmatkesh and J.S. Ibbott "Performance evaluation of MRI-based PAGAT polymer gel dosimeter in an inhomogeneous phantom using EGSnrc code on a co-60 machine", Applied Radiation and Isotopes, 2009, 67, 186-191

96- T. Allahverdi, M. Allahverdi, N. Riahi Alam, M.R. Ay, M. Zahmatkesh "Verifying the accuracy of dose distribution in Gamma Knife unit in presence of inhomogeneities using PAGAT polymer gel dosimeter and MC simulation", Iranian J. of Radiation Research, 2009, 7, 49-56

97- S. Lashkari, S. Sarkar, M.R. Ay and A. Rahmim "The Influence of Crystal Material on Intercrystal Scattering and the Parallax Effect in PET Block Detectors: A Monte Carlo Study", 4th Kuala Lumpur International Conference on Biomedical Engineering, 25-28 June 2008, Kuala Lumpur, Malaysia, IFMBE Proceedings Series, Vol. 21, pp 633-636

98- A. Rahmim, J. Tang, M. A. Lodge, S. Lashkari, M.R. Ay, R. Lautamaki, B. M. W. Tsui, and F. Bengel "Analytic System Matrix Resolution Modeling in PET: An Application to Rb-82 Myocardial Perfusion Imaging", Physics in Medicine and Biology, 2008, 53, 5947-5965

99- M. Shirmohammad, M.R. Ay, S. Sarkar and A. Rahmim "Comparing 511 keV attenuation maps obtained from different energy mapping methods for CT based attenuation correction of PET data", Iran J. Medical Physics , 2008,5, 23-34

100- A. Ahmadian, M.R. Ay, J.H. Bidgoli, S. Sarkar and H. Zaidi "Correction of oral contrast artefacts in CT-based attenuation correction of PET images using an automated segmentation algorithm", European Journal of Nuclear Medicine and Molecular Imaging, 2008, 35, 1812-1823

101- S. Lashkari, S. Sarkar, M.R. Ay, R. Rahmim "The Influence of Crystal Material on Intercrystal Scattering and the Parallax Effect in PET Block Detectors: A Monte Carlo Study", Iran J. Medical Physics , 2008, 21, 67-76

102- M.R. Ay and S. Sarkar "Computed Tomography Based Attenuation Correction in PET/CT: Principles, Instrumentation, Protocols, Artifacts and Future Trends", Iranian J. Nucl. Med., 2007, 15, 1-29

103- H. Zaidi and M.R. Ay "Current status and new horizons in Monte Carlo simulation of x-ray CT scanners", Medical & Biological Engineering & Computing , 2007, 45, 809-817

104- M.R. Ay and H. Zaidi "Impact of x-ray tube settings and metallic leads on neurological PET imaging when using CT-based attenuation correction", Nuclear. Instrumentation Methods in Physics Research A , 2007, 571, 411-417

105- M.R. Ay and H. Zaidi "Assessment of errors caused by x-ray scatter and use of contrast medium when using CT-based attenuation correction in PET", European Journal of Nuclear Medicine and Molecular Imaging, 2006, 33 (11), 1301-1313

106- M.R. Ay and H. Zaidi "Computed tomography-based attenuation correction in neurological positron emission tomography: evaluation of the effect of x-ray tube voltage on quantitative analysis", Nuclear Medicine Communication, 2006, 27, 339-346

107- M.R. Ay, S. Sarkar, M. Shahriari, D. Sardari, and H. Zaidi "Assessment of different computational models for generation of x-ray spectra in diagnostic radiology and mammography", Medical Physics, 32(6), pp. 1660-1675, 2005

108- M.R. Ay and H. Zaidi "Development and validation of MCNP4C-based Monte Carlo simulator for fan- and cone-beam x-ray CT", Physics in Medicine and Biology, 2005. 50(20): pp. 4863-4885

109- M.R. Ay, S. Sarkar, M. Shahriari and P. Ghafarian "Measurement of Organ Dose in Abdomen-Pelvis CT Exam as a Function of mA, KVp and Scanner Type by Monte Carlo Method", Iranian J. of Radiation Research, 1(4), 187-194, 2004

110- M.R. Ay, M. Shahriari, S. Sarkar, M. Adib and H. Zaidi "Monte Carlo simulation of x-ray spectra in diagnostic radiology and mammography using MCNP4C", Physics in Medicine and Biology, 49(19) pp. 4897-4917, 2004

Proceeding and Conference Records

1- P Ghafarian, A Ketabi, A Doroudinia, M Bakhshayesh Karam, MR Ay "Effect of TOF and PSF in detection of lymph node metastases in head and neck of PET/CT images", EUROPEAN JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING, 2016, Vol 43, pp s507

2- H Ghadiri, M B Shiran, H R Soltanian-Zadeh, A Rahmim and M R Ay "A fast and hardware mimicking analytic CT simulator", IEEE Nuclear Science Symposium & Medical Imaging Conference, Seoul, South Korea, 2013, pp 1-5

3- Mehranian A, H. Salighe Rad, M.R. Ay , Rahmim A, and Zaidi H "Smoothly Clipped Absolute Deviation (SCAD) Regularization for Compressed Sensing MRI Using an Augmented Lagrangian Scheme", IEEE Nuclear Science Symposium & Medical Imaging Conference, Anaheim, CA, USA, 2012, pp 3646-3653

4- Mehranian A, M.R. Ay, Rahmim A, and Zaidi H "An Ordered-Subsets Proximal Preconditioned Gradient Algorithm for Total Variation Regularized PET Image Reconstruction", IEEE Nuclear Science Symposium & Medical Imaging Conference, Anaheim, CA, USA, 2012, pp 3375-3382

5- Ghadiri H, Shiran MB, M.R. Ay, Soltanian-Zadeh H and Zaidi H "A novel energy mapping approach in CT-based attenuation correction of PET data using multi-energy CT imaging", IEEE Nuclear Science Symposium & Medical Imaging Conference, Valencia, Spain, 23-29 October 2011, p. 2510-2515

6- A. Emami, H. Ghadiri, M.R. Ay, S. Akhlagpour, A. Eslami, P. Ghafarian and S. Taghizadeh "A Novel Phantom for Accurate Performance Assessment of Bone Mineral Measurement Techniques: DEXA and QCT", IEEE Nuclear Science Symposium & Medical Imaging Conference, Valencia, Spain, 23-29 October 2011, p. 3441-3445

7- Najafi Darmian A, M.R. Ay, Ghafarian P, Pouladian M, Shirazi A, Ghadiri H, Akbarzadeh A and Zaidi H "Characterization of scattered radiation profile in volumetric 64-slice x-ray CT scanner: A Monte Carlo study", IEEE Nuclear Science Symposium & Medical Imaging Conference, Valencia, Spain, 23-29 October 2011, p. 2692–2696

8- H. Mohy-ud-Din, N. Karakatsanis, C. Endres, M. R. Ay, D. F. Wong, and A. Rahmim "Generalized inter-frame and intra-frame motion correction in dynamic PET imaging", IEEE Nuclear Science Symposium & Medical Imaging Conference, Valencia, Spain, 23-29 October 2011, p. 3858-3862

9- Akbarzadeh A, M.R. Ay, Ahmadian A, Riahi Alam N and Zaidi H "Impact of tissue classification on the accuracy of MR-based attenuation correction in PET-MRI", IEEE Nuclear Science Symposium & Medical Imaging Conference, Valencia, Spain, 23-29 October 2011, p. 2524–2530

10- Mehranian A, M.R. Ay, Rahmim A and Zaidi H "Metal artifact reduction in CT-based attenuation correction of PET using Sobolev sinogram restoration", IEEE Nuclear Science Symposium & Medical Imaging Conference, Valencia, Spain, 23-29 October 2011, P. 2936-2942

11- Mehranian A, M.R. Ay , Rahmim A, and Zaidi H "Sparsity constrained sinogram inpainting for metal artifact reduction in x-ray computed tomography", IEEE Nuclear Science Symposium & Medical Imaging Conference, Valencia, Spain, 23-29 October 2011, p. 3694–3699

12- Khodadad D, Ahmadian A, M.R. Ay, Esfahani AF, Banaem HY and Zaidi H "B-spline based free form deformation thoracic non-rigid registration of CT and PET images", International Conference on Graphic and Image Processing (ICGIP 2011), 1-3 October 2011, Cairo, Egypt, Proc. SPIE, Vol. 8285, pp 82851K

13- A. Emami, H. Ghadiri, M.R. Ay, S. Akhlagpour, A. Eslami, P. Ghafarian and S. Taghizadeh "A Novel Phantom for Accurate Performance Assessment of Bone Mineral Measurement Techniques: DEXA and QCT", 5th Kuala Lumpur International Conference on Biomedical Engineering, 20-23 June 2011, Kuala Lumpur, Malaysia, IFMBE Proceedings 35, p. 47-50

14- A. Najafi Darmian, M.R. Ay, M. Pouladian, A. Shirazi, H.Ghadiri and A. Akbarzadeh "Monte Carlo Characterization of Scattered radiation profile in Volumetric 64 slice CT using GATE", 5th Kuala Lumpur International Conference on Biomedical Engineering, 20-23 June 2011, Kuala Lumpur, Malaysia, IFMBE Proceedings 35, p. 694-697

15- F. Adibpour, M.R. Ay, S. Sarkar and G. Loudos "Quantification of Inter-crystal Scattering and Parallax Effect in Pixelated High Resolution Small Animal Gamma Camera: A Monte Carlo Study", 5th Kuala Lumpur International Conference on Biomedical Engineering, 20-23 June 2011, Kuala Lumpur, Malaysia, IFMBE Proceedings 35, p. 708-711

16- N. Ghazanfari, M.R. Ay, N. Zeraatkar, S. Sarkar and G. Loudos "Quantitative Assessment of the influence of crystal material and size on the Inter Crystal Scattering and Penetration effect in pixilated dual head small animal PET scanner", 5th Kuala Lumpur International Conference on Biomedical Engineering, 20-23 June 2011, Kuala Lumpur, Malaysia, IFMBE Proceedings 35, p. 712-715

17- A. Rahmim, J. Tang, M.R. Ay and F. M. Bengel "4D Respiratory motion-corrected Rb-82 myocardial perfusion PET imaging", IEEE Nuclear Science Symposium & Medical Imaging Conference, Knoxville, Tennessee, 2010, pp. 3312-3316

18- B. Teimourian, M.R. Ay, H. Ghadiri, M. Shamsaei Zafarghandi and H. Zaidi "A Novel Approach for Implementation of Dual Energy Mapping Technique in CT-Based Attenuation Correction Using Single kVP Imaging: A Feasibility Study", 12th Mediterranean Conference on Medical and Biological Engineering and Computing (MEDICON 2010), Chalkidiki, Greece, MEDICON 2010, IFMBE Proceedings 29, pp. 220–223, 2010

19- N. Zeraatkar, M.R. Ay, A. Kamali-Asl and H. Zaidi "A Novel Model for Monte Carlo Simulation of Performance Parameters of the Rodent Research PET (RRPET) Camera Based on NEMA NU-4 Standards", 12th Mediterranean Conference on Medical and Biological Engineering and Computing (MEDICON 2010), Chalkidiki, Greece, MEDICON 2010, IFMBE Proceedings 29, pp. 311–314, 2010

20- A. Mehranian, M.R. Ay and H. Zaidi "CT2MCNP: An Integrated Package for Constructing Patient-Specific Voxel-Based Phantoms Dedicated for MCNP(X) Monte Carlo Code", 12th Mediterranean Conference on Medical and Biological Engineering and Computing (MEDICON 2010), Chalkidiki, Greece, MEDICON 2010, IFMBE Proceedings 29, pp. 319–322, 2010

21- S.M. Akbari, M.R. Ay, A. Kamali Asl, H. Ghadiri and H. Zaidi "Experimental Measurement of Modulation Transfer Function (MTF) in Five Commercial CT Scanners", 12th Mediterranean Conference on Medical and Biological Engineering and Computing (MEDICON 2010), Chalkidiki, Greece, MEDICON 2010, IFMBE Proceedings 29, pp. 351–354, 2010

22- N. Zeraatkar, M.R. Ay, S. Sarkar, P. Geramifar and A. Rahmim "Quantification of Inter-Crystal Scatter and Penetration Events in GE Discovery RX PET/CT Scanner: a Monte Carlo Simulation", IEEE Nuclear Science Symposium & Medical Imaging Conference, Knoxville, Tennessee, 2010, pp. 2403-2408

23- M.A. Habibzadeh, M.R. Ay, A. Kamali Asl, H. Ghadiri and H. Zaidi "The Influence of Patient Miscentering on Patient Dose and Image Noise in Two Commercial CT Scanners", 12th Mediterranean Conference on Medical and Biological Engineering and Computing (MEDICON 2010), Chalkidiki, Greece, MEDICON 2010, IFMBE Proceedings 29, pp. 327–330, 2010

24- L. Karimiafshar, N. Riyahi Alam, M.R. Ay, M. Alahverdi, T. Alahvirdi Pourfallah , H. Hashemi, A. Farahani,B. Rafiei and M. Bakhtiar "A Novel Application of MRI-Polymer Gel Dosimeter for Measurement of CTDI on X-Ray 64 Slices CT Scanner", The World Congress on Medical Physics and Biomedical Engineering, Germany, Munich, 7-12 September 2009, IFMBE Proceedings 25, pp. 541-544

25- R. Prasad, M.R Ay, O. Ratib and H. Zaidi "CT-based attenuation correction on the FLEX Triumph™ preclinical PET/CT scanner", IEEE Nuclear Science Symposium & Medical Imaging Conference, Orlando (FL) USA, 25-31 October 2009, 3357-3362

26- A. Mehranian , M.R. Ay, N. Riahi Alam and H. Zaidi "Quantitative assessment of the effect of anode surface roughness on diagnostic x-ray spectra using Monte Carlo simulation", IEEE Nuclear Science Symposium & Medical Imaging Conference, Orlando (FL) USA, 25-31 October 2009, 2902-2907

27- M. Abdoli , M.R. Ay, A. Ahmadian and H. Zaidi "Reduction of dental filling metallic artifacts in CT-based attenuation correction of PET data using weighted virtual sinograms", IEEE Nuclear Science Symposium & Medical Imaging Conference, Orlando (FL) USA, 25-31 October 2009, 2752-2755

28- M. Abdoli, M.R. Ay, A. Ahmadian and H. Zaidi "Metal Artifact Reduction in CT-Based Attenuation Correction of PET Data Using the Virtual Sinogram Concept", 3rd International Conference on Bioinformatics and Biomedical Engineering (IEEE iCBBE 2009), June 11th to 13th, 2009, 1-4, Beijing, China

29- P. Ghafarian and S.M.R. Aghamiri, M.R. Ay, A. Rahmim and H. Zaidi "Quantification of PET and CT Data Misalignment Errors in Cardiac PET/CT: Clinical and Phantom Studies", 3rd International Conference on Bioinformatics and Biomedical Engineering (IEEE iCBBE 2009), June 11th to 13th, 2009, 1-4, Beijing, China

30- M.R. Ay, A. Maleki, H. Ghadiri, P. Ghafarian, A. Ahmadian and H. Zaidi "The Influence of X-ray Spectra Filtration on Image Quality and Patient Dose in the GE VCT 64-Slice Cardiac CT Scanner", The 3rd International Conference on Bioinformatics and Biomedical Engineering (IEEE iCBBE 2009), June 11th to 13th, 2009, 1-4, Beijing, China

31- M. Abdoli, M.R Ay, A. Ahmadian, N. Sahba and H. Zaidi "A novel approach for reducing dental filling artefacts in CT-based attenuation correction of head and neck oncologic PET/CT data", 4th European Congress of the International Federation of Medical and Biological Engineering, Antwerp, Belgium, 23-27 November 2008 ECIFMBE 2008, IFMBE Proceedings 22, pp. 492–495

32- M. Shirmohammad, M.R. Ay, A. Rahmim, S. Sarkar and H. Zaidi "Comparative assessment of different energy mapping approaches in CT based attenuation correction: a patient study", 4th European Congress of the International Federation of Medical and Biological Engineering, Antwerp, Belgium, 23-27 November 2008 ECIFMBE 2008, IFMBE Proceedings 22, pp. 496–499

33- N. Dehestani, S. Sarkar, M.R. Ay, M. Sadeghi and M. Shafaei "Comparative Assessment of Rotating Slat and Parallel Hole Collimator Performance in GE DST-Xli Gamma Camera: A Monte Carlo Study", 4th European Congress of the International Federation of Medical and Biological Engineering, Antwerp, Belgium, 23-27 November 2008 ECIFMBE 2008, IFMBE Proceedings 22, pp. 1062–1065

34- M. Shafaei, M.R. Ay, S. Sardari and H. Zaidi "Monte Carlo assessment of geometric, scatter and septal penetration components in high energy collimators", 4th European Congress of the International Federation of Medical and Biological Engineering, Antwerp, Belgium, 23-27 November 2008 ECIFMBE 2008, IFMBE Proceedings 22, pp. 2479–2482

35- M.R. Ay, J.H. Bidgoli, P. Ghafarian and H. Zaidi "Reduction of Intravenous Contrast Related Artifacts in CT-based Attenuation Corrected PET Images", 4th European Congress of the International Federation of Medical and Biological Engineering, Antwerp, Belgium, 23-27 November 2008 ECIFMBE 2008, IFMBE Proceedings 22, pp. 513–516

36- M. Rasouli, M.R. Ay, A. Takavar, S. Lashkari and G. Loudos "The Influence of InterCrystal Scattering on Detection Efficiency of Dedicated Breast Gamma Camera: A Monte Carlo Study", 4th European Congress of the International Federation of Medical and Biological Engineering, Antwerp, Belgium, 23-27 November 2008 ECIFMBE 2008, IFMBE Proceedings 22, pp. 2451–2454

37- A. Akbarzadeh, M.R. Ay, H. Ghadiri, S. Sarkar and H. Zaidi "A hybrid approach for accurate estimation of the scatter component in x-ray CT combining experimental measurements and Monte Carlo simulations", IEEE Nuclear Science Symposium & Medical Imaging Conference, Dresden, Germany, 19-25 October 2008, 3864-3867

38- P. Geramifar, M.R. Ay, M. Shamsai Zafarghandi, G. Loudos, A. Rahmim "Monte Carlo Based Performance Assessment of Four Commercial GE Discovery PET/CT Scanners Using GATE", IEEE Nuclear Science Symposium & Medical Imaging Conference, Dresden, Germany, 19-25 October 2008, 3995-3999

39- A. Rahmim, J. Tang, M. A. Lodge, S. Lashkari, M.R. Ay, R. Lautamaki, B. M. W. Tsui, and F. Bengel "Rb-82 Cardiac PET Imaging with Resolution Modeling", IEEE Nuclear Science Symposium & Medical Imaging Conference, Dresden, Germany, 19-25 October 2008, 3643-3650

40- A. Akbarzadeh A, M.R. Ay, H. Ghadiri, S. Sarkar and H. Zaidi "A novel approach for experimental measurement of scatter profile and scatter to primary ratio in a 64-slice CT scanner", 4th Kuala Lumpur International Conference on Biomedical Engineering, 25-28 June 2008, Kuala Lumpur, Malaysia, IFMBE Proceedings Series, Vol. 21, pp 473-477

41- M. Shirmohammad, M.R. Ay, H. Ghadiri, S. Sarkar and A. Rahmim "Comparative Assessment of Different Energy Mapping Methods for Generation of 511- keV Attenuation Map from CT Images in PET/CT Systems: A Phantom Study", 5th IEEE International Symposium on Biomedical Imaging: From Nano to Macro, 14-17 May, Paris, France, 2008, 644-647

42- P. Geramifar, M.R. Ay, M. Shamsayee, G. Lodous and A. Rahmim "Monte Carlo Assessment of Time-of-Flight Benefits on The LYSO-Based Discovery RX PET/CT Scanner", 5th IEEE International Symposium on Biomedical Imaging: From Nano to Macro, 14-17 May, Paris, France, 2008, 364-367

43- A. Rahmim, M. Lodge, J. Tang, S. Lashkari and M.R. Ay "Analytic System Matrix Resolution in PET: An Application to RB-82 Cardiac Imaging", 5th IEEE International Symposium on Biomedical Imaging: From Nano to Macro, 14-17 May, Paris, France, 2008, 1307-1310

44- P. Allahverdi, N. Riahi Alam, M. Allahverdi, M.R. Ay, M. Zahmatkesh M "EGSnrc calculated and MRI-Polymer Gel Dosimeter Measured Dose Distribution of Gamma Knife in Presence of Inhomogeneities", International Congress of Medical physics, India, 2008

45- P. Allahverdi, N. Riahi Alam, M. Allahverdi, M.R. Ay, M. Zahmatkesh M "Evaluation of Dose Delivery Accuracy of Gamma Knife Using MRI Polymer Gel Dosimeter in an Inhomogeneous Phantom", 5th Congress on Radiotherpy Gel Dosimetry, 2008 , Greece, 399-403

46- M.R. Ay, P. Ghafarian and H. Zaidi "A hybrid approach for fast simulation of x-ray computed tomography", Proceedings of IEEE Nuclear Science Symposium & Medical Imaging Conference, Honolulu, Hawaii, 28 October – 3 November 2007, Vol. 4, pp 3155-3160

47- J.H. Bidgoli, M.R. Ay, S. Sarkar, A. Ahmadian and H. Zaidi "Correction of correction of PET images using an automated segmentation algorithm", Proceedings of IEEE Nuclear Science Symposium & Medical Imaging Conference, Honolulu, Hawaii, 28 October – 3 November 2007, Vol. 5, pp 3542-3547

48- P. Ghafarian, M.R. Ay, H. Ghadiri, S. Sarkar and H. Zaidi "Impact of x-ray tube voltage, field size and phantom thickness on scattered radiation in diagnostic radiology: A Monte Carlo investigation", Proceedings of IEEE Nuclear Science Symposium & Medical Imaging Conference, Honolulu, Hawaii, 28 October – 3 November 2007, Vol. 5, pp 3830-3834

49- M.R. Ay, H. Ghadiri, P. Ghafarian, S. Sarkar and H. Zaidi "Influence of energy indexing algorithm and electron substeps on MCNP4C electron transport: Application to simulation of x-ray spectra in diagnostic radiology and mammography", Proceedings of IEEE Nuclear Science Symposium & Medical Imaging Conference, Honolulu, Hawaii, 28 October – 3 November 2007, Vol. 5, pp 4006-4011

50- H. Ghadiri and M.R. Ay "A Novel Hybrid Approach for Measurement of Bone Mineral Density and Content with High Signal to Noise Ratio", Proceedings of World Congress on Medical physics and Biomedical Engineerin, Seoul, Korea, August 27 – September 1, 2006, pp. 1324-1327

51- H. Zaidi and M.R. Ay "Impact of x-ray scatter when using CT-based attenuation correction in PET: A Monte Carlo investigation", Proceedings of IEEE Nuclear Science Symposium & Medical Imaging Conference, San Diego, USA, 29 October - 4 November 2006, Vol. 4; pp. 2161-2165

52- M.R. Ay and H. Zaidi "Simulation-based assessment of the impact of contrast medium on CT-based attenuation correction in PET", Proceedings of IEEE Nuclear Science Symposium & Medical Imaging Conference. San Diego, USA, 29 October - 4 November 2006, Vol. 5; pp. 2731-2735

53- M.R. Ay, S. Sarkar, M. Shahriari, D. Sardari, and H. Zaidi "MCNP4C-based Monte Carlo simulator for fan- and cone-beam x-ray CT: development and experimental validation", 14th International Conference of Medical Physics. Biomedizinische Technik. 2005. Nuremberg, Germany, Sept. 14-17, 2005. 50 Suppl Part 1: pp. 360-361

54- M.R. Ay, S. Sarkar, M. Shahriari, D. Sardari, and H. Zaidi "Comparative assessment of different computational models for generation of x-ray spectra in diagnostic radiology and mammography", IEEE Nuclear Science Symposium & Medical Imaging Conference. 2004. Oct. 19-22, Rome, Italy. 4: pp. 4190-4194

Published Abstract

1- R. Sharif Pour, P. Ghafarian, A. Doroudinia, M. Bakhshayesh Karam and M. R. Ay "Reduction of Respiratory Induced Artefact in PET/CT Images using TOF Reconstruction", ACNM 2016

2- P. Ghafarian, S. M. Khamesi1, M. R. Golrokh Nodehi and M. R. Ay "Acceptance Test of the first Hospital Cyclotron for Production of PET tracers in Iran", World Congress on Medical Physics & Biomedical Engineering, 7-12 June 2015, Toronto, Canada, p 518

3- S. Hosseini, M. H. Farahani and M. R. Ay "An alternate mathematical modeling of image formation, and framework for performance analysis of positioning algorithms in the scintillation camera", World Congress on Medical Physics & Biomedical Engineering, 7-12 June 2015, Toronto, Canada, p 103

4- Z. Etemadi, A. Bitaran Rajabi, H. Malek, P. Ghafarian, N. Zeraatkar and M.R. Ay "Can Pacemaker and ICD degrade CT-Based Attenuation Corrected cardiac SPECT images?", World Congress on Medical Physics & Biomedical Engineering, 7-12 June 2015, Toronto, Canada, p 132

5- M. R. Ay, Z. Etemadi, A. Bitarafan-Rajabi, H. Malek, N. Zeraatkar and P. Ghafarian "Correction of Metal Artefacts Induced from Pacemaker and ICD Leads in CT-Based Attenuation Correction of Cardiac SPECT data", World Congress on Medical Physics & Biomedical Engineering, 7-12 June 2015, Toronto, Canada, p 522

6- S. Nezhaddehghani1, S. Sarkar, and M. R. Ay "Design, modeling and performance evaluation of a small animal Micro-CT scanner: A Monte Carlo study", World Congress on Medical Physics & Biomedical Engineering, 7-12 June 2015, Toronto, Canada, p 97

7- H. Saligheh Rad, M. Shirin Shandiz, P. Ghafarian, M. H. Arabi, M. Bakhshayeshkaram, N. Shafiei and M. R. Ay "Generating a four-class attenuation map for MR-based attenuation correction of PET data in pelvis region using an automatic segmentation protocol", World Congress on Medical Physics & Biomedical Engineering, 7-12 June 2015, Toronto, Canada, p 201

8- P. Khateri, H. Saligheh Rad, A. Homayoun Jafari, A. Fathi, A. Akbarzadeh, M. Shojae Moghadam, A. Aryan, P. Ghafarian and M.R. Ay "Generation of 4-Class Attenuation Map for MRI Based Attenuation Correction of PET Data in the Head Area Using a Novel Combination of STE/DIXON-MRI and FCM Clustering", World Congress on Medical Physics & Biomedical Engineering, 7-12 June 2015, Toronto, Canada, p 371

9- S. Ahangari1, P. Ghafarian, M. Bakhshayeshkaram and M. R. Ay "Impact of Point spread function modeling on tumor quantification in clinical PET/CT imaging", World Congress on Medical Physics & Biomedical Engineering, 7-12 June 2015, Toronto, Canada, p 133

10- P. Ghafarian, S. M. Khamesi, M. R. Golrokh Nodehi and M.R. Ay "Measurement of Photon and Neutron Dose Distribution in Cyclotron Bunker During F18 and N13 Production", World Congress on Medical Physics & Biomedical Engineering, 7-12 June 2015, Toronto, Canada, p 606

11- M. R. Ay, S. Nezhaddehghani1, and S. Sarkar "Monte Carlo Simulation of X-ray Spectra in Computed Tomography Scanner using GATE", World Congress on Medical Physics & Biomedical Engineering, 7-12 June 2015, Toronto, Canada, p 331

12- M. R. Ay, H. Mahani, G. Raisali, and A. Kamali-Asl "Optimal Pixelated Crystal for a Molecular SPECT Scanner: A GATE Monte Carlo Study", World Congress on Medical Physics & Biomedical Engineering, 7-12 June 2015, Toronto, Canada, p 200

13- H. Mahani, G. Raisali, A. Kamali-Asl and M.R. Ay "Spinning Knife-Edge Slit-Hole: a Novel Collimation for High-Sensitivity Molecular SPECT", World Congress on Medical Physics & Biomedical Engineering, 7-12 June 2015, Toronto, Canada, p 200

14- M. Shekari, P. Ghafarian, M. Bakhshayeshkaram and M. R. Ay "The Impact of time of flight algorithm and PSF modeling on standard uptake value in clinical PET/CT imaging", World Congress on Medical Physics & Biomedical Engineering, 7-12 June 2015, Toronto, Canada, p 132

15- P. Ghafarian, S. Zargan, A. Shabestani Monfared, A. Sharafi, M. Bakhshayeshkaram and M.R. Ay "TLD Measurement of Absorbed Dose of Workers in PET/CT Department", World Congress on Medical Physics & Biomedical Engineering, 7-12 June 2015, Toronto, Canada, p109

16- S. Gholami S , H. Nedaie, F. Longo, M. R. Ay, AS. Meigooni "An optimal Grid block design for spatially fractionated radiation therapy", ESTRO 2015

17- S. Gholami, AS. Meigooni, H. Nedaie, F. Longo M. R. Ay "Impact of the Radiation Sensitivity of Tumor and Geometric Design of the GRID Block On the Clinical Response of Grid Therapy", Med. Phys. 42, 3440 (2015); http://dx.doi.org/10.1118/1.4924823

18- V. Moji, N. Zaratkar, S. Sajedi, A. Akbarzadeh, B. Timourian, M.H. Farahani and M. R. Ay "Design and development of small fieldof view portable gamma camera for localization of sentinel lymph nodes", 18th Iranian Conference of Nuclear Medicine, Tehran, Iran, 12-14 November 2104, pp. 70

19- S. Nerzhaddehghani, S. Sarkar and M.R. Ay "Development of a hybrid small animal SPECT/CT scanner:a Monte Carlo study", 18th Iranian Conference of Nuclear Medicine, Tehran, Iran, 12-14 November 2104, pp. 71

20- S. Zargan, A. Monfared, P. Ghafarian, A. K. Sharafi, M. Bakhshayesh karam and M.R. Ay "Experimental measurement of absorbed dose using TLD for radiation workers in PET/CT department", 18th Iranian Conference of Nuclear Medicine, Tehran, Iran, 12-14 November 2104, pp. 157

21- H. Mahani, G. Raisali, A. Kamali asl and M.R. Ay "Monte Carlo-based characterization of HiReSPECT scanner: a dedicatd small animal SPECT imaging system", 18th Iranian Conference of Nuclear Medicine, Tehran, Iran, 12-14 November 2104, pp. 73

22- S. Ahanghari, P. Ghafarian, M. Sherkari, M. Bakhshayesh karam and M.R. Ay "Optimizing the acquisition time in whole body PET/CT imaging", 18th Iranian Conference of Nuclear Medicine, Tehran, Iran, 12-14 November 2104, pp. 75

23- N. Gorjizadeh, S. Farzanehfar, A. Kaviani, N. Zeraatkar, M. H. Farhani, S. Sajesi and M.R. Ay "Performance evaluation of surgical gamma probe for sentinel lymph node localization based on NMA NU3-2004 standard", 18th Iranian Conference of Nuclear Medicine, Tehran, Iran, 12-14 November 2104, pp. 77

24- H. Mahani, G. Raisali, A. Kamali asl and M.R. Ay  "Quantification of inter-crystal scatter and penetration in HiReSPCT: a dedicated small animal SPCT imaging systm", 18th Iranian Conference of Nuclear Medicine, Tehran, Iran, 12-14 November 2104, pp. 78

25- Fathi, M. H. Arbabi, M.R. Ay and H. Saligheh Rad "A Fully Automated and Reproducible Level-set Segmentation Approach for Generation of MR-Based Attenuation Correction Map of PET Images in the Brain Employing Single STE-MR Imaging Modality", PSMR 2014 MR-PET Workshop, Kos Island, Greece, 19-21 May 2014, EJNMMI Physics 2014, 1(Suppl 1):A48

26- M. Shirin Shandiz, M. H. Arabi, P. Ghafarian, M. Bakhshayesh Karam , H. Saligheh Rad and M.R. Ay "A hybrid method for generation of attenuation map for MR-based attenuation correction of PET data in prostate PET/MR imaging", PSMR 2014 MR-PET Workshop, Kos Island, Greece, 19-21 May 2014, EJNMMI Physics 2014, 1(Suppl 1):A77

27- M. H. Arabi, A. Fathi, P. Khateri, M.R. Ay and H. Saligheh Rad "MR-Based Attenuation Map Generation in Short-TE MR Images of the Head Employing Spatial Fuzzy C-Means Clustering Approach", PSMR 2014 MR-PET Workshop, Kos Island, Greece, 19-21 May 2014, EJNMMI Physics 2014, 1(Suppl 1):A49

28- P. Geramifar, M. Shamsaie Zafarghandi and M.R. Ay "Optical Flow Based Method for Generation of Virtual Average CT: A Simulation Study Using 4D XCAT Phantom", European Association of Nuclear Medicine Annual Congress, 19-23 October 2013, Lyon, France. Eur J Nucl Med Mol, Vol 20, Issue 2

29- N. Gorjizadeh, N. Zeraatkar, A. Kaviani, S. Farzaneh far, M. H. Farahani, A. Akbarzadeh, S. Sajedi, B. Teimourian and M.R. Ay "Performance Evaluation of a Small Field of View Portable Gamma Camera for Localization of Sentinel Lymph Nodes", European Association of Nuclear Medicine Annual Congress, 19-23 October 2013, Lyon, France. Eur J Nucl Med Mol, Vol 20, Issue 2

30- M.R. Ay, N. Zeraatkar, N. Gorjizadeh, S. Sajedi, H. Arabi, M. H. Farahani, B. Teimourian "SURGEOGUIDE: a Gamma Probe for Localization of Sentinel Lymph Nodes", European Association of Nuclear Medicine Annual Congress, 19-23 October 2013, Lyon, France. Eur J Nucl Med Mol, Vol 20, Issue 2

31- P. Ghafarian and M.R. Ay "The Influence of Misalignment Artifact Due to Global and Respiratory Motion on Interpretation of Cardiac PET/CT Examination: Clinical and Phantom Studies", European Association of Nuclear Medicine Annual Congress, 19-23 October 2013, Lyon, France. Eur J Nucl Med Mol, , Vol 20, Issue 2

32- P. Geramifar, M. Shamsaie Zafarghandi and M.R. Ay "Variation in Thoracic Lesions SUVmax as a Function of Respiratory Phase Based on the Optical Flow Motion Estimation: A Simulation Study Using 4D XCAT Phantom", European Association of Nuclear Medicine Annual Congress, 19-23 October 2013, Lyon, France. Eur J Nucl Med Mol, Vol 20, Issue 2

33- P. Khateri, H. Salighe Rad, A.H. Jafari and M.R. Ay "A Novel Segmentation Approach for Implementation of MRAC in Head and Neck PET/MRI Imaging Employing Short-TE MRI and 2-Point Dixon Method in Fuzzy C-Means Framework", PSMR 2013 MR-PET Workshop, Jülich, Germany, 6-7 May –2013

34- M.R. Ay, Akbarzadeh A, Ahmadian and Zaidi H "Classification of bones from MR images in torso PET-MR imaging using a statistical shape model", PSMR 2013 MR-PET Workshop, Jülich, Germany, 6-7 May –2013

35- H. Ghadiri, M.B. Shiran, H.R. Soltanian-Zadeh and M.R. Ay "A new energy mapping algorithm based on spectral CT images: application in PET/CT attenuation correction", Iranian Congress of Nuclear Medicine, Shiraz, Iran, May 1-3, 2013

36- V.Moji, M. Aghamiri, H. Farahani, N. Zeratkar, S. Sajedi, B. Teymorian and M.R. Ay "Performance evaluation of HiReSPECT a dedicated animal SPECT system using modified NEMA standards", Iranian Congress of Nuclear Medicine, Shiraz, Iran, May 1-3, 2013

37- H. Mahani, A. R. Kamali-Asl, V. Moslemi, M.R. Ay "Spatial Resolution and System Sensitivity in a Tilted-Head Planar-SPECT: a Monte Carlo Study", Iranian Congress of Nuclear Medicine, Shiraz, Iran, May 1-3, 2013

38- N. Zeraatkar, M. H. Farahani, H. Arabi, S. Sarkar, S. Sajedi, N. Naderi, P. Ghafarian, A. Rahmim and M.R. Ay "An Innovative Rotation-Based Iterative Resolution Recovery for HiReSPECT™: a Dedicated Small Animal SPECT System", European Association of Nuclear Medicine Annual Congress, 27-31 October 2012, Milan, Itly. Eur J Nucl Med Mol, S386-S387

39- M.R. Ay , H. Arabi, M. H. Farahani, N. Zeraatkar, S. Sarkar, S. Sajed, N. Naderi and P. Ghafaian "Design and Development of a High Resolution Small Animal Imaging System for Mice and Rat", European Association of Nuclear Medicine Annual Congress, 27-31 October 2012, Milan, Itly. Eur J Nucl Med Mol, S441

40- P. Khareti, H. Salighe Rad, and M.R. Ay "Determination of Attenuation Map at 511 keV Employing 3D Short Echo-Time MR Imaging in the Head Area: Application in MR-Based AC of PET data", European Association of Nuclear Medicine Annual Congress, 27-31 October 2012, Milan, Itly. Eur J Nucl Med Mol, S369

41- S. Sajedi, M.R. Ay, M. H. Farahani, N. Zeraatkar, H. Arabi, and N. Naderi "Digital signal processing unit for nuclear detection system", European Association of Nuclear Medicine Annual Congress, 27-31 October 2012, Milan, Itly. Eur J Nucl Med Mol, S498

42- M. Sedighpoor, P. Ghafarian, A. Emami, M.R. Ay "Evaluation of the influence of respiratory motion misalignment between PET and CT data on diagnosis of heart defects using 4D XCAT phantom and STIR reconstruction", European Association of Nuclear Medicine Annual Congress, 27-31 October 2012, Milan, Itly. Eur J Nucl Med Mol, S515

43- L. Saleki, A. Bitarafan-Rajabi, N. Yaghobi, B. Falahi, and M.R. Ay "Quantification of the influence of misregistration between CT and SPECT images on the accuracy of CT-based attenuation correction of cardiac images in hybrid SPECT/CT systems", European Association of Nuclear Medicine Annual Congress, 27-31 October 2012, Milan, Itly. Eur J Nucl Med Mol, S518

44- P. Geramifar, M. Shamsaie Zafarghandi, M.R. Ay "Standardized Uptake Value-Based Evaluations of Respiratory-Induced Errors in CTAC PET Images: A Simulation Study Using 4D XCAT Phantom", European Association of Nuclear Medicine Annual Congress, 27-31 October 2012, Milan, Itly. Eur J Nucl Med Mol, S403

45- M.R. Ay , H. Arabi, M. H. Farahani, N. Zeraatkar, S. Sarkar, S. Sajed, N. Naderi and P. Ghafaian "SURGEOSIGHT-TM: An Intraoprative Hand Held Gamma Camera for Precise Localization of Sentine Lymph Nodes", European Association of Nuclear Medicine Annual Congress, 27-31 October 2012, Milan, Itly. Eur J Nucl Med Mol, S385

46- N. Ghazanfari, M.R. Ay, S.Sarkar and G.Loudos "The influence of crystal material and size on the performance of partial-rotating dual head small animal PET scanners: Quantitative evaluation using Monte Carlo modeling", European Association of Nuclear Medicine Annual Congress, 27-31 October 2012, Milan, Itly. Eur J Nucl Med Mol, S442

47- A. Emami-Ardekani, F. Kalantari, H. Rajabi, M.R. Ay, A. Fard, M. Eftekhari "The influence of resolution recovery during image reconstruction on quantitative brain SPECT imaging", European Association of Nuclear Medicine Annual Congress, 27-31 October 2012, Milan, Itly. Eur J Nucl Med Mol, S500

48- P. Khareti, H. Salighe Rad, A. Fathi and M.R. Ay "Generation of attenuation map for MR-based attenuation correction of PET data in the head area employing 3D short echo time MR imaging", Proc. PSMR Conference, Isola de Elba, Italy 26-30 May , p. 70, 2012

49- A. Mehranian, H. S. Rad, M.R. Ay, and A. Rahmim "3D TV-Based Compressed MR Image Reconstruction Using a Primal Dual Algorithm", Proc. Intl. Soc. Mag. Reson. Med., vol. 20, pp. 4228, 2012

50- A. Mehranian, A. Rahmim, and M.R. Ay "A proximal splitting algorithm for TV-regularized PET image reconstruction", Proc. Asia Oceania Congress of Nucl. Med. & Biology, vol. 20 (suppl. 1), p. 43, 2012

51- M. Khamesi, A. Kamali Asl, M. Masoudi, N. Zeraatkar, and M.R. Ay "Development of a fully 3D image reconstruction for a pinhole animal SPECT", Proc. Asia Oceania Congress of Nucl. Med. & Biology, vol. 20 (suppl. 1), p. 122, 2012

52- N. Zeraatkar, M. H. Farahani, H. Arabi, S. Sarkar, S. Sajedi, A. Rahmim, and M.R. Ay "Development of image reconstruction code with collimator-detector response function compensation for a preclinical SPECT scanner", Proc. Asia Oceania Congress of Nucl. Med. & Biology, vol. 20 (suppl. 1), p. 36, 2012

53- A. Rahmim, Y. Zhou, J. Price, J. Tang, L. Lu, M.R. Ay, G. Smith, V. Sossi, and D. Wong "Generalized 4D AB-OSEM direct parametric imaging: application to PiB-PET", J. Nucl. Med., vol. 53 (suppl. 1): 313, 2012

54- H. Arabi, M. H. Farahani, N. Zeraatkar, S. Sarkar, S. Sajedi, A. Rahmim, P. Ghafarian and M.R. Ay "High resolution small animal SPECT: HiReSPECT for preclinical imaging", Proc. Asia Oceania Congress of Nucl. Med. & Biology, vol. 20 (suppl. 1), p. 93, 2012

55- M.R. Ay "HiReSPECT an in house high resolution SPECT imaging system", Proc. Asia Oceania Congress of Nucl. Med. & Biology, vol. 20 (suppl. 1), p. 10, 2012

56- S. Sajedi, M. H. Farahani, H. Arabi, N. Zeraatkar, and M.R. Ay "Implementation of data acquisition board with digital signal processing capability for nuclear imaging and spectrometry devices", Proc. Asia Oceania Congress of Nucl. Med. & Biology, vol. 20 (suppl. 1), p. 39, 2012

57- A. Emami, H. Ghadiri, P. Ghafarian and M.R. Ay "QCT technique optimization by dual energy CT", Proc. Asia Oceania Congress of Nucl. Med. & Biology, vol. 20 (suppl. 1), p. 125, 2012

58- M. Sedigpoor, M.R. Ay, P. Ghafarian, P. Farnia "Quantification of the influence of respiratory motion induced misalignment between PET and CT data on diagnosis of heart disease in cardiac PET/CT imaging", Proc. Asia Oceania Congress of Nucl. Med. & Biology, vol. 20 (suppl. 1), p. 129, 2012

59- H. Ghadiri, M.B. Shiran, H. Zaidi, H. Soltanian Zadeh and M.R. Ay "The accuracy of dual energy mapping approach in CTAC in presence of low concentration of contract agent", Proc. Asia Oceania Congress of Nucl. Med. & Biology, vol. 20 (suppl. 1), p. 60, 2012

60- M. Masoudi, A. Kamali Asl, M. Khamesi, H. Arabi and M.R. Ay "The influence of opening angels and collimator material on the spatial resolution of pinhole collimator in animal SPECT imaging", Proc. Asia Oceania Congress of Nucl. Med. & Biology, vol. 20 (suppl. 1), p. 122, 2012

61- F. Vedaei, M.R. Ay, A. Kamali asl, F. Kalantari "Assessment of the impact of applying attenuation correction on the accuracy of activity recovery in TC99m-ECD brain SPECT of healthy subject using statistical parameter mapping", 3th International Congress of Nuclear Medicine, Tehran, Iran, 2011, pp 92

62- N. Ghazanfari, M.R. Ay, S. Sarkar and G. Lodous "Assessment of the influence of crystal material and size on the performance of dual head small animal PET scanners", 3th International Congress of Nuclear Medicine, Tehran, Iran, 2011, pp 108

63- H. Ghadiri, M. Shiran, M.R. Ay, H. Zaidi, H. Soltanian Zadeh "Bone material decomposition by energy resolved CT-based attenuation correction of PET", 3th International Congress of Nuclear Medicine, Tehran, Iran, 2011, pp 98

64- P. Ghafarian, M.R. Ay and J. Hassani "Correction of contrast agent induced srtifacts in CT-based attenuation correction of cardiac PET data using a semi-automated segmentation algorithm", 3th International Congress of Nuclear Medicine, Tehran, Iran, 2011, pp 110

65- A. Emami, H. Ghadiri, M.R. Ay, S. Akhlagpour, P. Ghafarian and S. Taghizadeh "Is percentage error of bone density determined by DEXA technique influenced by density?", 3th International Congress of Nuclear Medicine, Tehran, Iran, 2011, pp 88

66- F. Adibpour, M.R. Ay, S. Sarkar and G. Lodous "Photon scatter and penetration in parallel hole collimator in preclinical Gamma Camera: A Monte Carlo study", 3th International Congress of Nuclear Medicine, Tehran, Iran, 2011, pp 147

67- M.R. Teimoori, Sh. Akhlagpour, M.R. Ay, F. Kalantari and M. Amoui "Quantification of bremsstrahlung images with respect to post radioemoblization liver dosimetry", 3th International Congress of Nuclear Medicine, Tehran, Iran, 2011, pp 103

68- A. Anvari, M.R. Ay and B. Fallahi "The influence of misalignment between PET and CT images on the accuracy of CT-based attenuation correction in thorax imaging: a simuation study", 3th International Congress of Nuclear Medicine, Tehran, Iran, 2011, pp 190

69- A. Rahmim, J. Tang, H. Muhy-ud-Din, M.R. Ay, and M. A. Lodge "Use of optimization transfer for enhanced direct 4D parametric imaging in myocardial perfusion PET", Society of Nuclear Medicine (SNM) Annual Meeting, 2011, San Antonio, Texas, USA, J. Nucl. Med., vol. 52 (Supplement 1): 265, 2011

70- E. Saeedzadeh, A. Abbaspour, S. Sarkar, M.R. Ay, H.R. Khosravi "Accurate 3D Dosimetry for Internal Radiotherapy by Considering the Effect of Nonuniform Activity Distribution", The International Congress of Nuclear Medicine, Mashhad, Iran, Iranian Journal of Nuclear Medicine, Vol. 18, Supp. 1, 2010, pp. 112

71- E. Saeed Zadeh, S. Sarkar, A. Abbaspour, M.R. Ay, H. Khosravi, G. Lodus "Accurate 3D-Dosimetry for Internal Radiotherapy with 131I Using GATE Monte Carlo Code", 9th Iranian Congress of Medical Physics, Tehran, Iran, 2010, pp 116

72- N. Zeraatkar, M.R. Ay, A.R. Kamali-Asl, H. Zaidi "Accurate Modeling for Monte Carlo Based Performance Evaluation of The PET Subsystem of the FLEX Triumph Priclinical PET/CT Scanner Using NEMA NU-4 Standard", 10th Congress of the World Federation of Nuclear Medicine and Biology (WFNMB 2010), Cape Town, South Africa, South Africa, World Journal of Nuclear Medicine, Vol. 9, Supp. 1, 2010, pp. S-163

73- M.R. Ay "Advances in Multimodality Molecular Imaging Instrumentation", The International Congress of Nuclear Medicine, Mashhad, Iran, Iranian Journal of Nuclear Medicine, Vol. 18, Supp. 1, 2010, pp. 77

74- N. Ghazanfari, M.R. Ay, S. Sarkar and G. Loudos "Assessment of the Influence of Crystal Material and Size on the Sensitivity of Dual Head Small Animal PET Scanner", The International Congress of Nuclear Medicine, Mashhad, Iran, Iranian Journal of Nuclear Medicine, Vol. 18, Supp. 1, 2010, pp. 120

75- P. Ghafarian, S.M.R. Aghamiri, M.R. Ay, A. Fard Esfahani and H. Zaidi "Assessment of the Influence of PET and CT Data Misalignment Errors in Cardiac PET/CT Examination: Patient and Phantom Studies", The International Congress of Nuclear Medicine, Mashhad, Iran, Iranian Journal of Nuclear Medicine, Vol. 18, Supp. 1, 2010, pp. 81

76- P. Ghafarian, S.M.R. Aghamiri, M.R. Ay, B. Fallahi, A. Rahmim, T. Schindler, O. Ratib and H. Zaidi "Coronary Calcium Score Scan-Based Attenuation Correction in Viability PET Examination: A Feasibility Study", 10th Congress of the World Federation of Nuclear Medicine and Biology (WFNMB 2010), Cape Town, South Africa, World Journal of Nuclear Medicine, Vol. 9, Supp. 1, 2010, pp. S-16

77- M. Mollazadeh, , M. Allahverdi, T. Pourfallah, N. Riahi Alam, M.R. Ay "Evaluation of Dose Distribution in Co-60 Machine Using Radicromic Film and Monte Carlo", 16th Conference of Biomedical Engineering, Tehran, Iran, 2010, PP. 157

78- P. Ghafarian, S.M.R. Aghamiri, M.R. Ay, A. Fard Esfahani, A. Rahmim, T.H. Schindler, O. Ratib and H. Zaidi "Impact of Metal Artifact Reduction on Cardiac FDG-PET/CT Studies in the Presence pf pacemaker and Implantable Cardio Verter Defibrator Leads", The International Congress of Nuclear Medicine, Mashhad, Iran, Iranian Journal of Nuclear Medicine, Vol. 18, Supp. 1, 2010, pp. 104

79- M. Akbari, M.R. Ay, A. Kamali Asl, H. Ghadiri "Implementation and Comparison of to Empirical Methods for Calculation of MTF in CT", 16th Conference of Biomedical Engineering, Tehran, Iran, 2010, PP. 155

80- M. Abdoli, M.R. Ay, A. Ahmadian, R.A. Dierckx and H. Zaidi "Optimization of weighted virtual sinogram-based metal artifact reduction in CT-based attenuation correction of PET data using a genetic algorithm", European Association of Nuclear Medicine Annual Congress, 9-13 October 2010, Vienna, Austria. Eur J Nucl Med Mol Imaging, Vol 37, Suppl. 1, (2010)

81- F. Adibpour, M.R. Ay, S. Sarkar and G. Loudos "Performance Assessment and Optimization of Pixelated Gamma Camera with Small Field of View: A Monte Carlo Study", The International Congress of Nuclear Medicine, Mashhad, Iran, Iranian Journal of Nuclear Medicine, Vol. 18, Supp. 1, 2010, pp. 116

82- M.R. Ay, A. Mehranian, P. Ghafarian, M. Abdoli and H. Zaidi "Quantification and Correction of Metallic Artifact Arising from Implantable cardiac Pacing Devices in PET/CT Studies: A Phantom Study", 10th Congress of the World Federation of Nuclear Medicine and Biology (WFNMB 2010), Cape Town, South Africa, South Africa, World Journal of Nuclear Medicine, Vol. 9, Supp. 1, 2010, pp. S-20

83- N. Zeraatkar, M.R. Ay, S. Sarkar, A. Rahmim, P. Geramifar "Quantification of Inter Crystal Scatter and Parallax Events in LYSO-Based Discovery RX PET/CT Scanner: A Monte Carlo Study", 10th Congress of the World Federation of Nuclear Medicine and Biology (WFNMB 2010), Cape Town, South Africa, South Africa, World Journal of Nuclear Medicine, Vol. 9, Supp. 1, 2010, pp. S-158

84- Z. Anvari, M.R. Ay, B. Fallahi, F. Buther "Quantification of Respiratory Induced Artifact in CT-Based Attenuation Correction of PET Data: A Simulation Study", The International Congress of Nuclear Medicine, Mashhad, Iran, Iranian Journal of Nuclear Medicine, Vol. 18, Supp. 1, 2010, pp. 79

85- H. Arabi, N. Zeratkar, M.R. Ay, H. Zaidi "Quantitative Assessment if Inter-Crystal Scatter and Penetration in the PET Subsystem of the FLEX Triumph Preclinical Multi-Modality Scanner", The International Congress of Nuclear Medicine, Mashhad, Iran, Iranian Journal of Nuclear Medicine, Vol. 18, Supp. 1, 2010, pp. 40

86- E. Saeed Zadeh, S. Sarkar, A. Abbaspour, M.R. Ay, H. Khosravi, G. Lodus "The Effect of Nonuniform Activity Distribution in Three-Dimensional Dosimetry for Internal Radiotherapy with 131I", 10th Congress of the World Federation of Nuclear Medicine and Biology (WFNMB 2010), Cape Town, South Africa, South Africa, World Journal of Nuclear Medicine, Vol. 9, Supp. 1, 2010, pp. S-30

87- M. Habibzadeh, M.R. Ay, A. Kamali Asl, H. Ghadiri "The Influence of Patient Miscentering of Patient Dose and Image Noise in Two Commercial CT Scanners", 16th Conference of Biomedical Engineering, Tehran, Iran, 2010, PP. 158

88- B. Teimourian, M.R. Ay, M. Shamsaei Zafarghandi, H. Ghadiri and H. Zaidi "Virtual Dual Energy CT (VDECT): A Novel Approach for Improved Energy Mapping in CT-Based Attenuation Correction of PET Data", 10th Congress of the World Federation of Nuclear Medicine and Biology (WFNMB 2010), Cape Town, South Africa, South Africa, World Journal of Nuclear Medicine, Vol. 9, Supp. 1, 2010, pp. S-33

89- M. Abdoli, M.R. Ay, A. Ahmadian and H. Zaidi "Comparative assessment of image- and virtual sinogram-based metal artefact reduction techniques for CT-based attenuation correction in PET", European Association of Nuclear Medicine Annual Congress, 10-14 October 2009, Barcelona, Spain. Eur J Nucl Med Mol Imaging, Vol 36, Suppl. 1, pp S226

90- S. Lashkari, S. Sarkar, M.R. Ay and A. Rahmim "The Effect of Crystal Size on Position Detection Accuracy in PET Block Detectors: A Monte Carlo Study", European Association of Nuclear Medicine Annual Congress, 10-14 October 2009, Barcelona, Spain. Eur J Nucl Med Mol Imaging, Vol 36, Suppl. 1, pp S409

91- M.R. Ay "Challenges for Planning and Running a PET/CT and Cyclotron Facility", International Congress of Nuclear Medicine and Molecular Imaging, Tabriz, Iran, 23-25 September, 2009, pp. 10

92- P. Ghafarian, S.M.R. Aghamiri, M.R. Ay, A. Rahmim and H. Zaidi "CT Based Attenuation Correction in Cardiac PET/CT Using Calcium Score CT Image: A Feasibility Study", International Congress of Nuclear Medicine and Molecular Imaging, Tabriz, Iran, 23-25 September, 2009, pp. 9

93- M.R.Ay, M. Shirmohammad, S. Sarkar, A. Rahmim, H. Zaidi "Implementation and comparison of different energy mapping approaches in CT-based attenuation correction of PET", International Congress of Nuclear Medicine and Molecular Imaging, Tabriz, Iran, 23-25 September, 2009, pp. 51

94- B. Teimourian, M.R. Ay, M. Shamsaei Zafarghandi "Implementation of Dual Energy Mapping Techniques in CT-Based Attenuation Correction Method Using Single Energy Imaging: A Novel Approach for Reducing Patient Dose", International Congress of Nuclear Medicine and Molecular Imaging, Tabriz, Iran, 23-25 September, 2009, pp. 52

95- M.R. Ay "Strategies for Attenuation Correction in PET/CT and PET/MRI", International Congress of Nuclear Medicine and Molecular Imaging, Tabriz, Iran, 23-25 September, 2009, pp. 8

96- E. Saeedzadeh, S. Sarkar, A. Abbaspour Tehrani-Fard, M.R. Ay, H.R. Khosravi "Validation of the GATE Monte Carlo Code in Evaluation of Organ Doses Calculation in Zubal Voxelized Phantom", International Congress of Nuclear Medicine and Molecular Imaging, Tabriz, Iran, 23-25 September, 2009, pp. 50

97- M. Zabih Zadeh, M.R. Ay, M. Allahverdi, A. Mesbahi, S.R. Mahdavi and M. Shahriari "Monte Carlo Estimation of Photoneotrons Contamination from High Energy Medical Accelerator in Treatment Room and Maze", 10th Biennial ESTRO Conference on Physics and Radiation Technology for Clinical Radiotherapy, Maastricht, August 30 – September 3, 2009

98- L. Karimiafshar, N. Riahi Alanm and M.R. Ay "Evaluation of polymer gel dosimetry based on MRI imaging for measurement of CTDI in 64 slice CT scanner", 1st Congress of Radiation Protection in Radiotherapy, Diagnostic and Interventional Radiology, 19-20 February 2009, Tehran, Iran

99- M.R. Ay "PET/CT: Site Planning and Shielding Calculation", 1st Congress of Radiation Protection in Radiotherapy, Diagnostic and Interventional Radiology, 19-20 February 2009, Tehran, Iran, 43-44

100- M. Shafaee, M.R. Ay and D. Sardari "Characterization of Scatter and Penetration Using Monte Carlo Simulation in Ga-67 Imaging", 9th ASIA Oceania Congress of Nuclear Medicine and Biology, Oct 31st - Nov 4th, 2008, New Delhi, India, Indian Journal of Nuclear Medicine, Vol 23, p.171

101- M. Shirmohammad, M.R. Ay, A. Rahmim A, S. Sarkar and H. Zaidi "A novel energy mapping method for attenuation map generation at 511 keV in computed tomography based attenuation correction", European Association of Nuclear Medicine Annual Congress, 11-15 October 2008, Munich, Germany. Eur J Nucl Med Mol Imaging, Vol 35, Suppl. 2, S146

102- P. Geramifar, M.R. Ay, M. Shamsaii Zafarghandi,G. Lodous, A. Rahmim "Monte Carlo Simulation of The GE LYSO-Based Discovery RX PET/CT Scanner Using GATE: a Validation Study", European Association of Nuclear Medicine Annual Congress, 11-15 October 2008, Munich, Germany. Eur J Nucl Med Mol Imaging, Vol 35, Suppl. 2, S175-176

103- S. Lashkari, S. Sarkar, M.R. Ay and A. Rahmim "The Influence of Crystal Depth on Position Detection Accuracy and Detection Efficiency in PET Block Detector: A Monte Carlo Study", European Association of Nuclear Medicine Annual Congress, 11-15 October 2008, Munich, Germany. Eur J Nucl Med Mol Imaging, Vol 35, Suppl. 2, S337-338

104- A. Rahmim, J. Tang, M. A. Lodge, S. Lashkari, M.R. Ay, R. Lautamaki, B. M. Tsui, and F. Bengel "Improved clinical and quantitative dynamic Rb-82 cardiac imaging with resolution modelling", J. Nucl. Med., vol. 49 (Supplement 1): 62P, 2008

105- M.R. Ay, J.H. Bidgoli, S. Sarkar and A. Ahmadian "Automatic Segmentation of Oral Contrast Enhanced CT Images for Artifact Free Attenuation Correction in PET/CT", European Association of Nuclear Medicine Annual Congress, 13-19 October 2007, Copenhagen, Denmark. Eur J Nucl Med Mol Imaging, Vol 34, Suppl 2, S115

106- M. Shafaee, M.R. Ay, D. Sardari "Evaluation of Scatter and penetration in HEGP Collimator in DST Xli Gamma Camera During I131 Imaging", 14th Iranian Nuclear Science Conference, Yazd, Iran, 2007, P.111

107- P. Geramifar, M.R. Ay, M. Shamsaei "Validation and Performance Evaluation of Discovery Rx whole Body PET/CT Scanner Using GATE", 14th Iranian Nuclear Science Conference, Yazd, Iran, 2007, P.33

108- M.R. Ay and H Zaidi "Characterization of sources of artefact when using CT-based attenuation correction in PET", 7th annual congress of the Swiss Society of Nuclear Medicine (SSNM), Lausanne, Switzerland, 1-3 June 2006, Nuklearmedizin Vol 45, p. A139

109- M.R. Ay and H Zaidi "Assessment of the impact of x-ray tube voltage on quantitative analysis of neurological PET when using CT-based attenuation correction", 1st European conference in Molecular Imaging Technology, Marseille, France, 9-12 May 2006, p. 22

110- M.R. Ay, S. Sarkar, M. Shahriari, and P. Ghafarian "Estimating of patient dose in abdomen-pelvis CT exam as a function of scan techniques in single and multi-slice speiral CT by Monte Carlo method", 2th International Conference on Nuclear Science and Technology in Iran. Shiraz, Iran, 27-30 April 2004, p. 46

111- M.R. Ay, M. Shahriari, S. Sarkar, and P. Ghafarian "Measurement of organ dose in abdomen-pelvis CT exams as a function of mA, KVp and scanner type by Monte Carlo method", 3ed International Conference of The Effect of Low and Very Low Doses of Ionizing Radiation on Human Health. Tehran, Iran , 21-23 October 2003, p. 53

112- M.R. Ay, M. Adib, and H. Zaidi "Development of a Monte Carlo simulation package for scintillation cameras operation in single photon and coincidence imaging mode", Annual Congress of the European Association of Nuclear Medicine (EANM03). Amsterdam, The Netherlands, 23-28 August 2003, p. S326-S327

113- M.R. Ay "Image fusion in nuclear medicine", 7th Annual Meeting of Nuclear Medicine. Tehran, Iran, 2003: p. 45

114- M.R. Ay "Comparison of PET detectors", 6th Annual Meeting of Nuclear Medicine. Mashhad, Iran 2002, p. 31

115- M.R. Ay "Steps toward building a PET center", 6th Annual Meeting of Nuclear Medicine. Mashhad, Iran 2002, p. 29

116- M.R. Ay and M.E. Ashrafi "Providing software for PET (Coincidence) 3D simulation using Monte Carlo method", International Conference on Radiation and its Role in Diagnosis and Treatment (FICR2000). Tehran, Iran, 14-18 October 2000, p. 51

Developed Packages

1- M.R. Ay et al. MCNP4C-based Monte Carlo simulator for fan- and cone-beam x-ray CT, Presented in 14th International Conference of Medical Physics (ICMP 2005). Nuremberg, Germany, Sept. 14-17

2- M.R. Ay et al. Monte Carlo Simulation Package for Scintillation Cameras Operation in Single photon and Coincidence Imaging mode, Presented in Annual Congress of the European Association of Nuclear Medicine(EANM03), 2003, Amsterdam, Netherlands

3- M.R. Ay et al. Implementation of an X-ray Spectra Database in Diagnostic Radiology Energy Range Based on all computational Models

4- M.R. Ay et al. Implementation of an X-ray Spectra Database in Mammography Energy Range Based on all computational Models

Thesis Directed

1- ''Development of Molecular PET/CT imaging-based IMRT Treatment Planning and quantification of the impact of image reconstruction algorithms on local tumor control'',  2015, PhD Thesis

2- ''Design, modeling and performance evaluation of dedicated brain positron emission tomography with high resolution and sensitivity using Monte Carlo simulation'',  2015, PhD Thesis

3- ''Design, modeling and performance evaluation of small animal PETusing Monte Carlo simulation'',  2015, PhD Thesis

4- ''Design, Construction and Performance Evaluation of a Rotating Slit-Hole Collimator for Small-Animal SPECT Imaging'',  2014, PhD Thesis

5- ''A Novel hybrid method (protocol design and image segmentation) for generation of attenuation map at 511 keV from MR images in pelvis region for MR-based Attenuation correction in PET/MRI systems'',  2014, PhD Thesis

6- ''Implementation of quantitative analysis capability on the high resolution SPECT images in HiReSPECT system'',  2014, MSc Thesis

7- ''Motion compensation in cardiac SPECT imaging'',  2014, MSc Thesis

8- ''Design and optimization of oncologic imaging protocol in Dsicovery 690 PET/CT scanner based on clinical and phantom study'',  2013, MSc Thesis

9- ''Evaluation of the benefits of time of flight technique in PET imaging using quantitative and qualitative analysis of clinical and phantom images'',  2013, MSc Thesis

10- ''Design and Implementation of Performance Evaluation Protocol for PET/CT scanner based on International Standards'',  2013, MSc Thesis

11- ''Design, modeling and performance evaluation of small animal SPECT device with oblique detectors using Monte Carlo simulation'',  2012, MSc Thesis

12- ''Performance evaluation and optimization of a small field of view gamma camera and gamma probe used for the lymph nodes surgery using experimental measurements and Monte Carlo simulation'',  2012, MSc Thesis

13- ''Quantification and Correction of Metal Artifacts Arising from Pacemaker and ICD Leads in CT-based Attenuation Correction of Cardiac SPECT Imaging'',  2012, MSc Thesis

14- ''Designing, modeling and performance evaluation of micro-CT for small animal imaging using Monte Carlo simulation'',  2012, MSc Thesis

15- ''Implementation of Attenuation Correction Algorithm For Small Animal SPECT Imaging Using Atlas-Based Methods'',  2012, MSc Thesis

16- ''Quantification of the influence of misregistration between CT and SPECT images on the accuracy of CT-based attenuation correction of cardiac images in hybrid SPECT/CT systems'',  2011, MSc Thesis

17- ''Generation of Attenuation Map from MR images for Attenuation-Correction of PET data in Head Area: Focusing on Segmentation of Bone from Air Cavities'',  2011, MSc Thesis

18- ''Quantification of the influence of respiratory and cardiac motion induced mis alignment between CT and PET data of diagnosis accuracy of hart disease in cardiac PET/CT imaging'',  2010, MSc Thesis

19- ''Generation of attenuation map for hybrid PET/MRI systems using MRI image segmentation of torso based on bones morphology'',  2010, PhD Thesis

20- ''Reduction of Respiratory Induced Artifact in PET/CT Imaging Using Virtual Average CT'',  2010, PhD Thesis

21- ''Improving the Accuracy of Energy mapping algorithm in CT-Based Attenuation Correction of PET data Using Energy Sensitive CT'',  2010, PhD Thesis

22- ''Design and Performance Evaluation of Small Animal Gamma Camera Detection System Based on Pixelated Crystal Using Monte Carlo Simulation'',  2009, MSc Thesis

23- ''Modeling and optimization of detection system in multiple head small animal PET scanner using Monte Carlo method'',  2009, MSc Thesis

24- ''Quantification of Respiratory Induced Artifact in CT- Based Attenuation Correction of PET Data Using NCAT Phantom and Analytic Modeling in Lung Imaging'',  2009, MSc Thesis

25- ''A Novel Approach for Implementation of Dual Energy Mapping Technique in CT-Based Attenuation Correction Using Single kVP Imaging: A Feasibility Study'',  2008, MSc Thesis

26- ''Monte Carlo Characterization of Scattered Radiation in 64 Volumetric CT Using GATE'',  2008, MSc Thesis

27- ''Monte Carlo Modeling of RRPET Using GATE'',  2008, MSc Thesis

28- ''Noise Reduction on Ultra Low Dose CT images'',  2008, MSc Thesis

29- ''Dual Energy CT Imaging: Application in CT Based Attenuation Correction in PET ", Supervisor'',  2008, MSc Thesis

30- ''Monte Carlo assessment of the Influence of X-Ray Anode Surface Roughness on X-ray Spectra'',  2008, MSc Thesis

31- ''CTDI Measurement using gel dosimetry in 64 slice CT scanner'',  2008, MSc Thesis

32- ''Monte Carlo Assessment of photonutron contamination in Medical linear Accelerators'',  2008, PhD Thesis

33- ''Reduction of Dental Filling Artifact in CT-Based Attenuation Correction of PET Images'',  2008, MSc Thesis

34- ''Comparative assessment of different energy mapping methods for generation of attenuation map at 511 keV from CT images in hybrid PET/CT systems'',  2007, MSc Thesis

35- ''Optimization of dedicated gamma camera for high performance breast tumor imaging using Monte Carlo simulation'',  2007, PhD Thesis

36- ''Calculation of scatter profile in 64 slice CT scanners using experimental measurement and Monte Carlo simulation'',  2007, MSc Thesis

37- ''Improvement of image quality and patient’s dose reduction in 64 slice CT scanner by optimization of x-ray spectra filtration using experimental measurement and Monte Carlo simulation'',  2007, MSc Thesis

38- ''Monte Carlo assessment of the impact of inter crystal scattering on PET scanner’s PSF as a function of crystal size and material'',  2006, MSc Thesis

39- ''Evaluation of Scatter and Septal Penetration Components in LEGP and HEGP Collimator Using Monte Carlo Simulation'',  2006, MSc Thesis

40- ''Monte Carlo modeling and performance prediction of slit-slat collimator in low energy SPECT imaging using GATE'',  2006, MSc Thesis

41- ''Monte Carlo investigation of Time-of-Flight benefits for fully 3D PET'',  2006, MSc Thesis

Review Boards

Scientific Reviewer, IEEE Tran. Nuclear Sciences

Scientific Reviewer, German Research Foundation (Deutsche Forschungsgemeinschaft)

Scientific Reviewer, Journal of Medical Imaging

Scientific Reviewer, Medical Physics Official Journal of the American Association of Physicists in Medicine (AAPM)

Scientific Reviewer, Computer Methods and Programs in Biomedicine

Scientific Reviewer, Journal of Cancer Research and Therapeutics

Scientific Reviewer, Current Medical Imaging Reviews

Scientific Reviewer, Physics in Medicine and Biology

Scientific Reviewer, Progress in Biophysics and Molecular Biology

Scientific Reviewer, Iranian Journal of Nuclear Medicine

Scientific Reviewer, Iranian Journal of Medical Physics

Scientific Reviewer, Iranian Journal of Radiation Research

Scientific Reviewer, Iranian Journal of Radiology

Membership

Member of Institute of Electrical and Electronics Engineers (IEEE)

Member of European Association of Nuclear Medicine and Molecular Imaging (EANM)

Member of Institute of Physics and Engineering in Medicine (IPEM)

Member of Iranian Association of Medical Physics (IAMP)

Fellow Member of International Union Against Cancer (UICC)

Member of Consortium of Computational Human Phantoms (CCHP)

Member of Consortium of Computational Human Phantoms (CCHP)

Member of Iranian Association of Nuclear Medicine

Member of Iranian Association of Biomedical engineering

Member of International Organization for Medical Physics (IOMP)

Member of European Federation of Organizations of Medical Physics (EFOMP)

Member of European Society for Engineering and Medicine

Research

MRI-based attenuation correction in PET/MRI

Preclinical Imaging

Multimodality Imaging

High resolution animal imaging

CT-based attenuation correction in PET and SPECT

Monte Carlo simulation of imaging systems

Monte Carlo Simulation of CT Scanner Using MCNP

Monte Carlo simulation of X-ray spectra

Monte Carlo Simulation of PET Scanner by Eidolon

Development of Monte Carlo Simulation Package

Image Reconstruction

Medical Image Fusion

Quantitative Analysis of PET and PET/CT images

Quality Control of Nuclear Medicine Imaging systems

Shielding Design

Professional Experience

2010 - Present, CEO and Founder
Parto Negar Persia Co.

2012 - Present, Head of Research center for Molecular and Cellular Imaging
Tehran University of Medical Sciences, Tehran, Iran

2013 - Present, Radiation Safety Officer
Imam Khomeini Hospital Complex, Tehran University of Medical Sciences, Tehran, Iran

2008 - 2012, Deputy of Education
Department of Medical Physics and Biomedical Engineering, Tehran University of Medical Sciences, Tehran, Iran

2008 - 2010, Deputy of Research Affairs
Department of Medical Physics and Biomedical Engineering, Tehran University of Medical Sciences, Tehran, Iran

2008 - 2010, Deputy of International Affairs
Research Center for Science and Technology in Medicine, Tehran University of Medical Sciences, Tehran, Iran

2008 - Present, Head of Medical Imaging Systems Research Group
Research Center for Science and Technology in Medicine, Tehran University of Medical Sciences, Tehran, Iran

2004 - Present, Assistant Researcher
PET Instrumentation & Neuroimaging Laboratory, Geneva University Hospital, Geneva, Switzerland

2005 - 2006, Medical Image Fusion expert
Collaboration with radiotherapy department, Geneva University Hospital, Geneva, Switzerland

2001 - 2004, NM/PET group supervisor
- Installation of Gamma Camera in Lahore, Pakistan (1 Unit)
- Installation of Gamma Camera in Iran (5 Unit)
- Service and maintenance of Gamma camera (10 Unit)

1997 - 2004, General Electric Healthcare Authorized Agent in Iran

1999 - 2001, Vascular group supervisor
- Installation of LC+ Cardiac Angiography System in Iran (4 Unit)
- Installation of LCA Peripheral Angiography System in Iran (1 Unit)
- Service and maintenance of vascular systems (11 Unit)

1997 - 1999, CT scanner group service senior engineer
- Installation of Spiral and Conventional CT scanner in Iran (20 Unit)
- Service and maintenance of CT scanner systems (70 Unit)

Training Courses Taken

15th Aug - 19th Aug 2011, GE Healthcare Technologies, Waukesha, USA
PET discovery 600 series service training

8th Aug - 12th Aug 2011, GE Healthcare Technologies, Waukesha, USA
PET basic service training

1th Aug - 5th Aug 2011, GE Healthcare Technologies, Waukesha, USA
CT LightSpeed VCT full service training

18th July - 29th July 2011, GE Healthcare Technologies, Waukesha, USA
CT LightSpeed Pro full service training

14th Feb - 25th Feb 2011, GE Healthcare Technologies, Uppsala, Sweden
Minitrace Cyclotron service training

8th Feb - 11th Feb 2011, GE Healthcare Technologies, Uppsala, Sweden
Tracelab Mx FDG service training

24th Jan - 28th Jan 2011, University of Tubingen, Tubingen, Germany
Small animal imaging workshop

5th May - 9th May 2008, Accuray Incorporation Europe- Paris- France
Cyberknife Training Program

25th Oct - 17th Nov 2002, GE Medical Systems - Lausanne, Zurich - Switzerland
PET and PET/CT Maintenance and Quality Control (Job Training)

15th Jul - 27th Jul 2002, GE Medical Systems – Paris - France
Gamma Camera (DST-Xli) Maintenance and Quality Control

2th Jun - 28th Aug 2002, Isiran Institute – Tehran – Iran
Unix Administration (24 Hours)

14th Jan - 10th Mar 2002, Isiran Institute – Tehran – Iran
TCP/IP (24 Hours)

2th Feb - 7th Feb 2002, Atomic Energy Organization – Karaj – Iran
Advance Monte Carlo (MCNP) training Course (50 Hours)

25th Nov - 9 Dec 2001, GE Medical Systems – Paris – France
Gamma Camera (DSX/DS7) Maintenance and Quality Control

25th Jun - 6th Jul 2001, GE Medical Systems – Paris – France
Gamma Camera (DSXi) Maintenance and Quality Control

5th Jun - 9th Jun 2001, TPP CO. (GE Medical Systems Authorized Agent) – Tehran – Iran
Vascular Systems Maintenance (Advantx LC+ & LCA)

10th Nov - 15th Nov 2000, ElmoSanat University – Tehran – Iran
Monte Carlo (MCNP) Training Course (50 Hours)

22th Sep - 5th Nov 2000, Isiran Institute – Tehran – Iran
Unix Operating System (40 Hours)

Computer Skills

Programming with C++

Programming with Fortran

Matlab

Programming with Assembly Language (8051)

Unix

Windows

MCNP

Monte Carlo Packages in NM/PET


Teaching

Currrent Teaching

2010-2010 Quality Control of Nuclear Medicine Imaging systems for medical students-graduate course

 Medical Imaging 

 Monte Carlo Simulation 

 Molecular Imaging Instrumentation  

 Nuclear Medicine 

 Hybrid Imaging 

 Quantitative Analysis in Nuclear Medicine 

 Medical Physics 

 Introduction to Tracer Production 


Teaching History

2009-2009 Medical Physics 

for medical students


Contact & Meet Me

I would be happy to talk to you if you need my assistance in your research.

Email: mohammadreza_ay@tums.ac.ir