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Biography
Mohammad Reza Ay

Dr. Mohammad Reza Ay
Department of Medical Physics and Biomedical Engineering
Tehran University of Medical Sciences, Tehran, Iran
Associate Professor


Email:mohammadreza_ay@tums.ac.ir


Qualifications

2003-2006    Ph.D., Faculty of Science, Geneva University, Switzerland
1999-2004    Ph.D., Faculty of Physics, Tehran Polytechnic University, Iran
1996-1998    M.S., Faculty of Physics, Tehran Polytechnic University, Iran

1990-1995    B.S., Faculty of Electrical Engineering, Shiraz University School Of Engineering, Iran


Publications (selected)
  1. 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" 2012, Phys Med ,Vol. 28, in press
  2. 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" 2012, Hellenic Journal of Nuclear Medicine, in press
  3. 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.
  4. 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.
  5. M.A. Habibzadeh, M.R. Ay, A.R. Kamali Asl, H. Ghadiri and H. Zaidi H "Impact of
  6. miscentering on patient dose and image noise in x-ray CT imaging: Phantom and clinical studies" Phys Med Vol. 37, 2011 in press
  7. 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, 2011 in press
  8. 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.
  9. 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.
  10. 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
  11. 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.
  12. 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
  13. N. Zaratkar, M.R. Ay, A Kamaliasl and H. Zaidi, " Accurate Monte Carlo modeling and
  14. 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
  15. 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.
  16. 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.
  17. 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.
  18. 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.
  19. 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.
  20. 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.
  21. 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.
  22. 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.
  23. 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.
  24. 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.
  25. 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.
  26. 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.
  27. 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.
  28. 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.
  29. 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.
  30. 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.
  31. 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.
  32. 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.
  33. 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.
  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.

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