مقالات

International and National Patent

•      US Patent US 2021/11,150,360 B2, "ALTERING PATHS OF OPTICAL PHOTONS PASSING THROUGH A SCINTILLATOR"
• US Patent US 2020/0146649 A1, "NORMALIZATION OF A POSITRON EMISSION TOMOGRAPHY SCANNER"
• US Patent US 2018/0259656 A1, "SINGLE PHOTON EMISSION COMPUTED TOMOGRAPHY IMAGING WITH SPINNING PARALLEL-SLAT COLLIMATOR"
• US Patent US 2018/0113225 A1, "POSITION RANGE REDUCTION IM POSITION EMISSION TOMOGRAOHY IMAGING"
• US Patent US 2018/0101936 A1, "PEAK DETECTION IN A TWO-DIMENSIONAL IMAGE"
• US Patent US 2016/0220204 A1, 2016, "ROBOTIC SYSTEM FOR SPECT IMAGING"
• US Patent US 2016/0116604 A1, 2016, "DESKTOP OPEN-GANTRY SPECT IMAGING SYSTEM"
• US Patent US 8,503,748 B2, 2013, "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"

Publications

:Peer-reviewed Journal Publications

M. Amirrashedi et al., “Leveraging deep neural networks to improve numerical and perceptual image quality in low-dose preclinical PET imaging,” Computerized Medical Imaging and Graphics, vol. 94, Dec. 2021.

M. Amirrashedi, H. Zaidi, and M. R. Ay, “Advances in Preclinical PET Instrumentation,” PET Clinics, vol. 15, no. 4. W.B. Saunders, pp. 403–426, Oct. 2020.

M. Amirrashedi, H. Zaidi, and M. R. Ay, “Towards quantitative small-animal imaging on hybrid PET/CT and PET/MRI systems,” Clinical and Translational Imaging, vol. 8, no. 4. Springer, pp. 243–263, Aug. 2020.

M. Amirrashedi et al., “NEMA NU-4 2008 performance evaluation of Xtrim-PET: A prototype SiPM-based preclinical scanner,” Medical Physics, vol. 46, no. 11, pp. 4816–4825, Nov. 2019.

S. Sajedi et al., “Development and preliminary results of Xtrim-PET, a modular cost-effective preclinical scanner,” Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 940, pp. 288–295, Oct. 2019.

G. Mahmoudi, M. R. Fouladi, M. R. Ay, A. Rahmim, and H. Ghadiri, “Sparse-view statistical image reconstruction with improved total variation regularization for X-ray micro-CT imaging,” Journal of Instrumentation, vol. 14, no. 8, Aug. 2019.

R.Hashemi Shahraki, I.Shiri, P. Geramifar, A. Akbarzadeh, A.H. Sanaat, and M. R. Ay “Resolution Recovery with Pre Reconstruction Fourier Transforms Filtering for a High Resolution Animal SPECT System,” Frontiers in Biomedical Technologies, vol. 5, no. 3–4, pp. 74–80,Nov. 2018.

H.Mahani, G. Raisali, A. Kamali-Asl, and M. R. Ay, “Collimator-detector response compensation in molecular SPECT reconstruction using STIR framework,” Iranian Journal of Nuclear Medicine, vol. 25, no. 1, pp. 26–34, Feb. 2017.

N. Zeraatkar et al., “Development and calibration of a new gamma camera detector using large square Photomultiplier Tubes,” Journal of Instrumentation, vol. 12, no. 9, Sept. 2017.

H. Mahani, G. Raisali, A. Kamali-Asl, and M. R. Ay, “Spinning slithole collimation for high-sensitivity small animal SPECT: Design and assessment using GATE simulation,” Physica Medica, vol. 40, pp. 42–50, Aug. 2017.

S. K. Gerdekoohi et al., “Implementation of absolute quantification in small-animal SPECT imaging: Phantom and animal studies,” Journal of Applied Clinical Medical Physics, vol. 18, no. 4, pp. 215–223, Jul. 2017.

N. Zeraatkar, A. Rahmim, S. Sarkar, and M. R. Ay, “Development and Evaluation of Image Reconstruction Algorithms for a Novel Desktop SPECT System,” Asia Oceania Journal of Nuclear Medicine & Biologyl, vol. 5, no. 2, Mar. 2017.

A.Akbarzadeh, V. Saba, and M. R. Ay, “New approach for calibration of pixelated scintillation detectors of intraoperative gamma cameras,” Iranian Journal of Nuclear Medicine, vol. 25, no. 1, pp. 34–42, Jan. 2017.

S. Kaviani et al., “Development and characterization of a compact hand-held gamma probe system, SURGEOGUIDE, based on NEMA NU3-2004 standards,” Journal of Instrumentation, vol. 11, no. 12, Dec. 2016.

H. Mahani, G. Raisali, A. Kamali, and M.R. Ay. "Collimator-Detector Response Compensation in Molecular SPECT Reconstruction using STIR Framework," Iranian Journal of Nuclear Medicine and Molecular Imaging, 2016, in press

A. Fathi, M.R. Ay, S. Arfaei, and P. Khateri and H. Salighe 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, 2016, in press

H. Mahani, G. Raisali, A. Kamali-Asl, and M. R. Ay, “How crystal configuration affects the position detection accuracy in pixelated molecular SPECT imaging systems?,” Nuclear Science and Techniques, vol. 28, no. 4, Apr. 2017.

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,” Physica Medica, vol. 32, no. 7, pp. 889–897, Jul. 2016.

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 simulation study" Medical Physics, Vol. 43, No. 5, pp 2581-2597, 2016.

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? " Journal of Applied Clinical Medical Physics, 2016, in press

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 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" Molecular Imaging & Biology, 2015, Vol. 17, pp 884-892.

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.

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 " Frontiers in Biomedical Technologies, 2015, Vol. 2, No. 3, pp 146-154.

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.

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.

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.

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.

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.

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 NU1 2007 Standard " J Appl Clin Med Phys, 2014, Vol. 15, No. 6, pp 267-278.

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.

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.

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.

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.

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.

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.

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

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 " British Journal of Radiology, 2013, Vol. 86, No. 1029, in press

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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

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.

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

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

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

:Published Abstract

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

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

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. 2015;42:3440

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.

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.

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.

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.

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.

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.

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.

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.

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.

S. Ahangari, 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.

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.

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.

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.

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.

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

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.

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.

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.

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.

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.

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.

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

M. H. Arabi, A. Fathi, P. Khateri, M. R. Ay and H. Saligheh Rad " A Robust 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

A. 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

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.

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.

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.

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.

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.

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 Mai –2013.

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 Mai –2013.

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.

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.

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.

M. R. Ay , H. Arabi, M. H. Farahani, N. Zeraatkar, S. Sarkar, S. Sajed, N. Naderi and P. Ghafaian, " SURGEOSIGHTTM: 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.

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.

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.

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.

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.

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.

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.

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.

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.

A. Emami-Ardekani, F. Kalantari, H. Rajabi, M.R. Ay, A. Fard, M. Eftekhari et al "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.

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.

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.

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

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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

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.

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

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.

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.

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.

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.

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

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.

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.

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.

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.

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.

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.

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.

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.

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", 2010, The 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.

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 ", 2010, The 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.

Nominated as one of the best submitted abstracts

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", 2010, The 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.

Nominated as one of the best submitted abstracts

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", 2010, The 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.

Nominated as one of the best submitted abstracts

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", 2010, The 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.

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", 2010, The 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.

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) in press

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", (2009) Oral presentation at the 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.

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.

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", (2009) Poster presentation at the 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.

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.

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.

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.

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, in press

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.

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.

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.

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.

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.

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.

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

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", The 1st Congress of Radiation Protection in Radiotherapy, Diagnostic and Interventional Radiology, 19-20 February 2009, Tehran, Iran, 20-21.

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" (2008) Oral presentation at the European Association of Nuclear Medicine Annual Congress, 11-15 October 2008, Munich, Germany. Eur J Nucl Med Mol Imaging, Vol 35, Suppl. 2, S146.

Nominated as one of the best submitted abstracts

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" (2008) Oral presentation at the 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.

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" (2008) Poster at the 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.

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

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

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", Oral presentation at the European Association of Nuclear Medicine Annual Congress, 13-19 October 2007, Copenhagen, Denmark. Eur J Nucl Med Mol Imaging, Vol 34, Suppl 2, S115.

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

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

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", In 1st European conference in Molecular Imaging Technology, Marseille, France, 9-12 May 2006, p. 22.

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

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". In 2th International Conference on Nuclear Science and Technology in Iran. Shiraz, Iran, 27-30 April 2004, p. 46.

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". In Annual Congress of the European Association of Nuclear Medicine (EANM03). Amsterdam, The Netherlands, 23-28 August 2003, p. S326-S327.

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". In 3th 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.

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

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

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

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