1.
Optimizing Scan Time and Bayesian Penalized Likelihood Reconstruction Algorithm in Copper-64 PET/CT Imaging: A Phantom Study
Abbas Monsef, Peyman Sheikhzadeh, Joseph Steiner, Fatemeh Sadeghi, Mohammadreza Yazdani, Pardis Ghafarian
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Biomedical Physics & Engineering Express,2024
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2.
The effect of harmonization on the variability of PET radiomic features extracted using various segmentation methods
Seyyed Ali Hosseini, Isaac Shiri, Pardis Ghaffarian, Ghasem Hajianfar, Atlas Haddadi Avval, Milad Seyfi, Stijn Servaes, Pedro Rosa-Neto, Habib Zaidi, Mohammad Reza Ay
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Annals of Nuclear Medicine,2024,P 1-15
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3.
Article History
Hadi Rezaei, Peyman Sheikhzadeh, Pardis Ghafarian, Mohammad Reza Ay, Mohammad Reza Ay
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4.
Design and performance evaluation of partial geometry configurations of total-body PET: A Monte Carlo study
Hadi Rezaei, Peyman Sheikhzadeh, Pardis Ghafarian, Mohammad Reza Ay
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Iranian Journal of Nuclear Medicine,2023
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5.
Impact of random and scattered coincidences from outside of field of view on positron emission tomography/computed tomography imaging with different reconstruction protocols
Mahak Osouli Alamdari, Pardis Ghafarian, Arman Rahmim, Mehrdad Bakhshayesh-Karam, Mohammad Reza Ay
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Nuclear Science and Techniques,2023, V34,P 1-13
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6.
Exploring ASL perfusion MRI as a substitutive modality for 18F-FDG PET in determining the laterality of mesial temporal lobe epilepsy
Hossein Rahimzadeh, Hadi Kamkar, Pardis Ghafarian, Narges Hoseini-Tabatabaei, Neda Mohammadi-Mobarakeh, Jafar Mehvari-Habibabadi, Seyed-Sohrab Hashemi-Fesharaki & Mohammad-Reza Nazem-Zadeh
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Neurological Sciences,2023
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7.
List-mode quantitative joint reconstruction of activity and attenuation maps in Time-of-Flight PET
Hamidreza Hemmati, Alireza Kamali-Asl, Pardis Ghafarian, Arman Rahmim, Habib Zaidi8, and Mohammad Reza Ay
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Journal of Instrumentation
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8.
Accurate modeling and performance evaluation of a total-body pet scanner using Monte Carlo simulations
Hadi Rezaei , Peyman Sheikhzadeh, Pardis Ghafarian, Habib Zaidi , Mohammad Reza Ay
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Medical Physics
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9.
Role of Lesion-to-Background Activity Ratio and Background Activity in Optimization of Reconstruction Protocols for FDG PET/CT Images of Overweight Patients: A Phantom Study
samira Rezvani , avatar Pardis Ghafarian * , avatar Mehrdad Bakhshayesh Karam, avatar Mohammadreza Ay
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Iranian Journal Of Radiology,2023,
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10.
Impact of Various Image Reconstruction Methods on Joint Compensation of Respiratory Motion and Partial Volume Effects in Whole-Body 18F-FDG PET/CT Imaging: Patients with Non-Small Cell Lung Cancer
Pardis Ghafarian1 , Sahar Rezaei * 2, Esmaeil Gharepapagh3, Saeid Sarkar4, Mohammad Reza Ay4
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Iran South Med J 2022, 25(4): 355-370
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11.
Reducing scan time using time-of-flight protocol in clinical [18F] FDG-PET/CT imaging: A feasibility study
Roya Sharifpour, Pardis Ghafarian, Mehrdad Bakhshayesh-Karam, Carlos F Uribe, Arman Rahmim, Mohammad Reza Ay
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Iranian Journal of Nuclear Medicine,2022,P 1-16
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12.
Recent advances in quantitative PET imaging
Pardis Ghafarian
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Frontiers in Biomedical Technologies,2022,P159-159
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13.
Harmonization based on quantitative analysis of standardized uptake value variations across PET/CT scanners: a multicenter phantom study
Abbas Monsef, Mohammad Reza Ay, Peyman Sheikhzadeh, Parham Geramifar, Arman Rahmim, Pardis Ghafarian
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Nuclear Medicine Communications,2022,V 43, P 1004-1014
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14.
Synergistic impact of motion and acquisition/reconstruction parameters on 18F‐FDG PET radiomic features in non‐small cell lung cancer: phantom and clinical …
Seyyed Ali Hosseini, Isaac Shiri, Ghasem Hajianfar, Bahador Bahadorzade, Pardis Ghafarian, Habib Zaidi, Mohammad Reza Ay
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Medical Physics,2022
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15.
The Impact of Preprocessing on the PET-CT Radiomics Features in Non-small Cell Lung Cancer
Seyyed Ali Hosseini, Isaac Shiri, Ghasem Hajianfar, Pardis Ghafarian, Mehrdad Bakhshayesh Karam, Mohammad Reza Ay
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Frontiers in Biomedical Technologies, 2021, V 8
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16.
Leveraging Deep Neural Networks to Improve Numerical and Perceptual Image Quality in, Low-dose Preclinical PET Imaging
Mahsa Amirrashedi, Saeed Sarkar, Hojjat Mamizadeh, Hossein Ghadiri, Pardis Ghafarian, Habib Zaidi, Mohammad Reza Ay
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Computerized Medical Imaging and Graphics, 2021,P 102010
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17.
Tumor volume-adapted SUV N as an alternative to SUV peak for quantification of small lesions in PET/CT imaging: a proof-of-concept study
Mohammad Amin Mosleh-Shirazi, Zahra Nasiri-Feshani, Pardis Ghafarian, Mehrosadat Alavi, Gholamhasan Haddadi, Ali Ketabi
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Japanese Journal of Radiology,2021, P 1-13
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18.
A Deep Neural Network To Recover Missing Data In Small Animal Pet Imaging: Comparison Between Sinogram-And Image-Domain Implementations
Mahsa Amirrashedi, Saeed Sarkar, Hossein Ghadiri, Pardis Ghafarian, Habib Zaidi, Mohammad Reza Ay
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2021 IEEE 18th International Symposium on Biomedical Imaging (ISBI)
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19.
Standard-dose PET reconstruction from low-dose preclinical images using an adopted all convolutional U-Net
Mahsa Amirrashedi, Saeed Sarkar, Hossein Ghadiri, Pardis Ghafarian, Mohammad Reza Ay
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Medical Imaging 2021: Biomedical Applications in Molecular, Structural, and Functional Imaging
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20.
Impact of Various Image Reconstruction Methods on Joint Compensation of Respiratory Motion and Partial Volume Effects in Whole-Body 18F-FDG PET/CT Imaging: Patients with Non-Small Cell Lung Cancer
Pardis Ghafarian1 , Sahar Rezaei * 2, Esmaeil Gharepapagh3, Saeid Sarkar4, Mohammad Reza Ay4
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Iran South Med J 2022, 25(4): 355-370
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21.
Impact of Various Image Reconstruction Methods on Joint Compensation of Respiratory Motion and Partial Volume Effects in Whole-Body 18F-FDG PET/CT Imaging: Patients with Non-Small Cell Lung Cancer
Pardis Ghafarian1 , Sahar Rezaei * 2, Esmaeil Gharepapagh3, Saeid Sarkar4, Mohammad Reza Ay4
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Iran South Med J 2022, 25(4): 355-370
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22.
Monte Carlo simulation and performance assessment of GE Discovery 690 VCT positron emission tomography/computed tomography scanner
Elham Kashian, Hadi Taleshi Ahangari, Vahab Dehlaghi, Karim Khoshgard, Pardis Ghafarian, Raheb Ghorbani
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World Journal of Nuclear Medicine, 2020, Vol 19, P 366
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23.
Performance evaluation of developed dedicated breast PET scanner and improvement of the spatial resolution by wobbling: a Monte Carlo study
Azadeh Emami, Hossein Ghadiri, Pardis Ghafarian, Parham Geramifar, Mohammad Reza Ay
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Japanese journal of radiology, 2020, Vol 38, P 790-799
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24.
The impact of iterative reconstruction protocol, signal-to-background ratio and background activity on measurement of PET spatial resolution
Sahar Rezaei, Pardis Ghafarian, Mehrdad Bakhshayesh-Karam, Carlos F Uribe, Arman Rahmim, Saeed Sarkar, Mohammad Reza Ay
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Japanese journal of radiology, 2020, Vol 38,P 231-239
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25.
Deep-JASC: joint attenuation and scatter correction in whole-body 18F-FDG PET using a deep residual network
Isaac Shiri, Hossein Arabi, Parham Geramifar, Ghasem Hajianfar, Pardis Ghafarian, Arman Rahmim, Mohammad Reza Ay, Habib Zaidi
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European journal of nuclear medicine and molecular imaging, 2020, Vol 47,
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26.
Molecular imaging approaches in the diagnosis of breast cancer: A systematic review and meta-analysis
Getu Ferenji Tadesse, Parham Geramifar, Pardis Ghafarian, Eshetu Ejeta Cheka, Eyachew Misgana Tegaw, Seifu Gizaw Feyisa, Ramin Sadeghi, Mohammad Reza Ay
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Iranian Journal of Nuclear Medicine,2020,Vol 28,P 1-13
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27.
Validation and evaluation of a GATE model for MAMMI PET scanner
Azadeh Emami, Pardis Ghafarian, Hossien Ghadiri, Parham Geramifar, Mohammad Reza Ay
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Iranian Journal of Nuclear Medicine, 2020, Vol 28, P 33-38
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28.
Evaluation of the Impact of Out-of-Axial FOV Scattering Medium on Random Coincidence Rates on Discovery 690 PET/CT Scanner: A Simulation Study
Mahak Osouli Alamdari, Pardis Ghafarian, Parham Geramifar, Mohammad Reza Ay
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Frontiers in Biomedical Technologies, 2019, V 6, P 181-186
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29.
Direct attenuation correction of brain PET images using only emission data via a deep convolutional encoder-decoder (Deep-DAC)
Isaac Shiri, Pardis Ghafarian, Parham Geramifar, Kevin Ho-Yin Leung, Mostafa Ghelichoghli, Mehrdad Oveisi, Arman Rahmim, Mohammad Reza Ay
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European radiology, 2019, V 29, P 6867-6879
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30.
Joint compensation of motion and partial volume effects by iterative deconvolution incorporating wavelet-based denoising in oncologic PET/CT imaging
Sahar Rezaei, Pardis Ghafarian, Abhinav K Jha, Arman Rahmim, Saeed Sarkar, Mohammad Reza Ay
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Physica Medica, 2019, V 68, P 52-60
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31.
NEMA NU‐4 2008 performance evaluation of Xtrim‐PET: A prototype SiPM‐based preclinical scanner
Mahsa Amirrashedi, Saeed Sarkar, Pardis Ghafarian, Reza Hashemi Shahraki, Parham Geramifar, Habib Zaidi, Mohammad Reza Ay
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Medical physics, 2019, V 46, P 4816-4825
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32.
Deep Direct Attenuation Correction of Brain PET images using Emission Data and Deep Convolutional Encoder-Decoder for application to PET/MR and dedicated brain PET scanners
I Shiri, P Ghafarian, P Geramifar, K Leung, M Oveisi, A Rahmim, M Ay
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EUROPEAN JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING, 2019
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33.
Design, optimization and performance evaluation of BM-PET: A simulation study
Peyman Sheikhzadeh, Hamid Sabet, Hossein Ghadiri, Parham Geramifar, Pardis Ghafarian, Mohammad Reza Ay
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Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2019, V 940, P274-282
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34.
Performance Evaluation of a Newly Designed SiPM-based Preclinical Scanner Based on NEMA-NU4 2008
Mahsa Amirrashedi, Saeed Sarkar, Reza Hashemi Shahraki, Parham Geramifar, Habib Zaidi, Mohammad Reza Ay
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EANM'19,2019
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35.
Joint compensation for motion and partial volume effects in PET/CT images of lung cancer patients: impact on quantification for different image reconstruction methods
Sahar Rezaei, Abhinav K Jha, Arman Rahmim, Saeed Sarkar, Mohammad Reza Ay
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EANM'19, 2019
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36.
Recovery of Missing Data in Partial Geometry Dedicated Breast PET Scanner Using Compressive Sensing
Azadeh Emami, Hossein Ghadiri, Parham Geramifar, Mohammad Reza Ay
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EANM'19, 2019
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37.
The influence of misregistration between CT and SPECT images on the accuracy of CT-based attenuation correction of cardiac SPECT/CT imaging: Phantom and clinical studies
Leila Saleki, Pardis Ghafarian, Ahmad Bitarafan-Rajabi, Nahid Yaghoobi, Babak Fallahi, Mohammad Reza Ay
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Iranian Journal of Nuclear Medicine, 2019, V 27, P 63-72
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38.
A novel method for measuring the mtf of ct scanners: A phantom study
Hamidreza Khodajou-Chokami, Seyed Abolfazl Hosseini, Mohammad Reza Ay, Ali Safarzadehamiri, Pardis Ghafarian, Habib Zaidi
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2019 IEEE International Symposium on Medical Measurements and Applications (MeMeA)
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39.
Design and performance evaluation of spheroid geometry for brain PET scanner using Monte Carlo modeling
Peyman Sheikhzadeh, Hossein Ghadiri, Parham Geramifar, Pardis Ghafarian, Mohammad Reza Ay
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Iranian Journal of Nuclear Medicine, 2019
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40.
HiResPET: high resolution PET image generation using deep convolution encoder decoder network
Isaac Shiri, Kevin Leung, Pardis Ghafarian, Parham Geramifar, Mehrdad Oveisi, Mohammad Reza Ay, Arman Rahmim
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Journal of Nuclear Medicine, 2019, V 60, P1368-1368
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41.
Simultaneous Attenuation Correction and Reconstruction of PET Images Using Deep Convolutional Encoder Decoder Networks from Emission Data
Isaac Shiri, Kevin Leung, Pardis Ghafarian, Parham Geramifar, Mehrdad Oveisi, Mohammad Reza Ay, Arman Rahmim
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Journal of Nuclear Medicine, 2019,V 60, P 1370-1370
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42.
PSFNET: ultrafast generation of PSF-modelled-like PET images using deep convolutional neural network
Isaac Shiri, Kevin Leung, Parham Geramifar, Pardis Ghafarian, Mehrdad Oveisi, Mohammad Reza Ay, Arman Rahmim
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Journal of Nuclear Medicine, 2019 , V 60, P 1369-1369
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43.
Impact of image reconstruction methods on quantitative accuracy and variability of FDG-PET volumetric and textural measures in solid tumors
Ali Ketabi, Pardis Ghafarian, Mohammad Amin Mosleh-Shirazi, Seyed Rabi Mahdavi, Arman Rahmim, Mohammad Reza Ay
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European radiology, 2019, Vol 29, P 2146-2156
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44.
Assessment the effect of CT localizer parameter on radiation dose and image quality of GE CT spiral images, A phantom study
Yazdan Salimi, MohammadReza Deevband, Pardis Ghafarian
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Iranian Journal of Medical Physics, 2018, Vol 15, P 323
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45.
Evaluation of methods of co-segmentation on PET/CT images of lung tumor: simulation study
Elham Kashian, Hadi Taleshi Ahangari, Vahab Dehlaghi, Karim Khoshgard, Pardis Ghafarian, Hossein Mousavie Anijdan, Shiva Zarifi
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Iranian Journal of Medical Physics,2018, Vol 15, P 35
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46.
Quantitative evaluation of TOF benefits indifferent tumor regions of Overweight patients in clinical PET/CT scanner
Hanieh Sadat Jozi, Pardis Ghafarian
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Iranian Journal of Medical Physics, 2018, Vol 15,P 84
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47.
Uncertainties in effective dose estimation for CT transmission scan in total body PET-CT imaging with Auto mA3D tube current modulation
Y Salimi, MR Deevband, P Ghafarian, MR Ay
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International Journal of Radiation Research,2018,Vol 16, P465-472
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48.
Monte Carlo simulation of MAMMI PET system and performance evaluation using GATE toolkit
Azadeh Emami, Hossein Ghadiri, Parham Geramifar, Mohammad Reza Ay
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EANM'18,2018
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49.
Reconstruction/segmentation of attenuation map in TOF-PET based on mixture models
Hamidreza Hemmati, Alireza Kamali-Asl, Pardis Ghafarian, Mohammad Reza Ay
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Annals of nuclear medicine, Vol 32, P474-484
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50.
Capturing bone signal in MRI of pelvis, as a large FOV region, using TWIST sequence and generating a 5-class attenuation map for prostate PET/MRI imaging
Mehdi Shirin Shandiz, Hamid Saligheh Rad, Pardis Ghafarian, Khadijeh Yaghoubi, Mohammad Reza Ay
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Molecular imaging, 2018, Vol 17,
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51.
Concept design and Monte Carlo performance evaluation of HeadphonePET: a novel brain-dedicated PET system based on partial cylindrical detectors
P Sheikhzadeh, H Sabet, H Ghadiri, P Geramifar, P Ghafarian, MR Ay
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Journal of Instrumentation,2018,Vol 13, P07008
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52.
Mixture model based joint-MAP reconstruction of attenuation and activity maps in TOF-PET
H Hemmati, A Kamali-Asl, P Ghafarian, MR Ay
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Journal of Instrumentation,2018,Vol 13
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53.
Comparison of PET/CT and CT-based tumor delineation and its effects on the radiation treatment planning for non-small cell lung cancer
Yasmin Yaraghi, Iraj Jabbari, Ali Akhavan, Pardis Ghaffarian, Shahram Monadi, Mohsen Saeb
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Iranian Journal of Nuclear Medicine,2018,Vol 26, P9-15
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54.
The influence of using different reconstruction algorithms on sensitivity of quantitative 18F-FDG-PET volumetric measures to background activity variation
Ali Ketabi, Pardis Ghafarian, Mohammad Amin Mosleh-Shirazi, Seyed Rabi Mahdavi, Mohammad Reza Ay
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Iranian Journal of Nuclear Medicine,2018, Vol 26, P87-97
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55.
Is correction for metallic artefacts mandatory in cardiac SPECT/CT imaging in the presence of pacemaker and implantable cardioverter defibrillator leads?
Zahra Etemadi, Pardis Ghafarian, Ahmad Bitarafan-Rajabi, Hadi Malek, Arman Rahmim, Mohammad Reza Ay
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Iranian Journal of Nuclear Medicine,2017, Vol 26, P 35-46
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56.
Quantification and reduction of respiratory induced artifacts in positron emission tomography/computed tomography using the time-of-flight technique
Roya Sharifpour, Pardis Ghafarian, Arman Rahmim, Mohammad R Ay
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Nuclear medicine communications,2017, Vol 38,P 948-955
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57.
Quantification of the impact of TOF and PSF on PET images using the noise-matching concept: clinical and phantom study
M Shekari, P Ghafarian, S Ahangari, MR Ay
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Nuclear Science and Techniques,2017,Vol 11, P 1-8
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58.
Evaluation of the Impact of Using TOF Technique on Metal Artifact Reduction in PET/CT Images
R Sharifpour, P Ghafarian, MR Ay
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EUROPEAN JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING,2017,Vol 44, S363-S364
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59.
Monte Carlo Based Performance estimation of breast PET due to reduction of the ring diameter
A Emami, H Ghadiri, P Ghafarian, M Ay
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EUROPEAN JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING,2017,Vol 44,S430-S430
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60.
Quantification and Reduction of respiratory induced errors in attenuation correction of PET data using respiration averaged CT: a simulation study
P Ghaffarian, F Fatemi, P Geramifar, M Ay
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EUROPEAN JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING,2017,Vol 44,S473-S474
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61.
Volume-based assessment of different image reconstruction algorithms and thresholds for FDG-PET/CT based on dose-painting concept
P Ghafarian, A Ketabi, MA Mosleh-Shirazi, MR Ay
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EUROPEAN JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING, 2017,Vol 44,S758-S758
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62.
Development of low dose CT protocols with acceptable CT image quality for CTAC of PET data: Phantom Study
Zahra Sadat Mojabi, Hossein Ghadiri, Mehrdad Bakhshayeshkaram, Mohammad Reza Ay
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EANM'17,2017
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63.
Is the averaged SUV from several hottest voxels an alternative to SUVpeak for quantification of large heterogeneous or small lesions in oncological PET imaging?
Ali Ketabi, Sadegh Masjoodi, Mohammad Mosleh-Shirazi, Mohammad Ay
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EANM'17,2017
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64.
Optimal quantitative SUV metrics over wide range of lesion sizes in advanced image reconstruction (TOF and PSF) for PET
Isaac Shiri, Saeed Ashrafinia, Ahmad Bitarafan-Rajabi, Mohammad Reza Ay, Arman Rahmim
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EANM'17,2017
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65.
Optimal quantitative SUV metrics over wide range of lesion sizes in advanced image reconstruction (TOF and PSF) for PET
Isaac Shiri, Saeed Ashrafinia, Ahmad Bitarafan-Rajabi, Mohammad Reza Ay, Arman Rahmim
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EANM'17,2017
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66.
Partial volume correction changes intra-tumoral heterogeneity in 18F-FDG PET
Isaac Shiri, Arman Rahmim, Ghasem Hajianfar, Hamid Abdollahi, Parham Geramifar, Ahmad Bitarafan-Rajabi
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EANM'17,2017
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67.
Sub-centimeter lesion detectability in Point-spread function (PSF) and Time of flight (TOF) reconstructed PET images
Isaac Shiri, Ahmad Bitarafan-Rajabi, Mohammad Reza Ay
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EANM'17,2017
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68.
Compton scatter tomography in TOF-PET
Hamidreza Hemmati, Alireza Kamali-Asl, Mohammadreza Ay, Pardis Ghafarian
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Physics in Medicine & Biology,2017,Vol 62, P 7641
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69.
Design optimization of partial cylindrical PET scanner based on trapezoid-shaped block detector and monolithic crystals using Monte Carlo simulation
Peyman Sheikhzadeh, Hossein Ghadiri, Parham Geramifar, Pardis Ghaffarian, Mohammadreza Ay
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EANM'17,2017
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70.
Development and validation of an accurate GATE model for NeuroPET scanner
Peyman Sheikhzadeh, Hamid Sabet, Hossein Ghadiri, Parham Geramifar, Hojjat Mahani, Pardis Ghafarian, Mohammad Reza Ay
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Physica Medica,2017, Vol 4, P 56-65
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71.
mplementation of absolute quantification in small‐animal SPECT imaging: Phantom and animal studies
Shabnam Khorasani Gerdekoohi, Naser Vosoughi, Kaveh Tanha, Majid Assadi, Pardis Ghafarian, Arman Rahmim, Mohammad Reza Ay
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Journal of applied clinical medical physics,2017,Vol 4, P 215-223
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72.
Evaluation of radiation exposure to staff and environment dose from [18F]-FDG in PET/CT and cyclotron center using thermoluminescent dosimetry
S Zargan, P Ghafarian, A Shabestani Monfared, AA Sharafi, M Bakhshayeshkaram, MR Ay
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Journal of biomedical physics & engineering,2017, Vol 7, P 1
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73.
Implementation of absolute quantification in small-animal SPECT imaging: Phantom and animal studies
Shabnam Khorasani Gerdekoohi, Naser Vosoughi, Kaveh Tanha, Majid Assadi, Pardis Ghafarian, Arman Rahmim, Mohammad Reza Ay
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MEDICAL IMAGING,2017, P 1-9
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74.
Impact of time-of-flight and point-spread-function for respiratory artifact reduction in PET/CT imaging: focus on standardized uptake value
Roya Sharifpour, Pardis Ghafarian, Mehrdad Bakhshayesh-Karam, Hamidreza Jamaati, Mohammad Reza Ay
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Tanaffos, 2017, Vol 16, P 127
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75.
The impact of image reconstruction settings on 18F-FDG PET radiomic features: multi-scanner phantom and patient studies
Isaac Shiri, Arman Rahmim, Pardis Ghaffarian, Parham Geramifar,Hamid Abdollahi
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European Radiology,2017,
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76.
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
M Shirin Shandiz, H Saligheh Rad, P Ghafarian, M Bakhshayesh Karam, Afshin Akbarzadeh, Mohammad Reza Ay
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Annals of nuclear medicine,2017, Vol 13, P 29-39
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77.
Quantification and Reduction of Respiratory Induced Artifact in Attenuation Correction of PET Data Using Respiration Averaged CT: a Simulation and Phantom Study
Fatemeh Sadat Fatemi Nasrollahi, Pardis Ghafarian, Parham Grramifar, Mohammad Reza Ay
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Frontiers in Biomedical Technologies,2016,Vol 3, P 49-59
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78.
Development and characterization of a compact hand-held gamma probe system, SURGEOGUIDE, based on NEMA NU3-2004 standards
S Kaviani, N Zeraatkar, S Sajedi, N Gorjizadeh, MH Farahani, P Ghafarian, G El Fakhri, H Sabet, MR Ay
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Journal of Instrumentation,2016,Vol 11,P T12004
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79.
Design and Performance evaluation of a Novel Brain PET Geometry Based on Partial Cylindrical Detector using Monte Carlo simulation
P. Sheikhzadeh, H. Sabet, H. Ghadiri, P. Ghafarian, M.R. Ay
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European Association of Nuclear Medicine Annual Congress, 15-19 October 2016, Barcelona, spain, Eur J Nucl Med Mol, Vol 43, S 94
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80.
Impact of advanced image reconstruction algorithm on qualitative and quantitative oncological 18F-FDG PET/CT
Shiri, P. Ghafarian, A. Bitarafan, M. BakhshaieshKaram, M.R. Ay
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European Association of Nuclear Medicine Annual Congress, 15-19 October 2016, Barcelona, Spain, Eur J Nucl Med Mol, Vol 43, S509
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81.
Optimization and evaluation of low dose CT protocol for attenuation correction of PET data
Z. Mojabi, P. Ghafarian, H. Ghadiri, M. Bakhshayeshkaram, H.Jamaati, M.R. Ay
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European Association of Nuclear Medicine Annual Congress, 15-19 October 2016, Barcelona, Spain, Eur J Nucl Med Mol, Vol 43, S486
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82.
Performance characteristics of NeuroPET system using GATE Monte Carlo simulation
P. Sheikhzadeh, H. Sabet, H. Ghadiri, P. Geramifar, H. Mahani,P. Ghafarian, M.R. Ay
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European Association of Nuclear Medicine Annual Congress,15-19 October 2016, Barcelona, Spain, Eur J Nucl Med Mol, Vol 43, S512
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83.
Radiomics texture features variability and Reproducibility in advance image reconstruction setting of oncological PET/CT
I. Shiri, A. Rahmim, H. Abdollahi1, P. Ghafarian, A. Bitarafan, M.R. Ay, M. BakhshaieshKaram
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European Association of Nuclear Medicine Annual Congress, 15-19 October 2016, Barcelona, Spain, Eur J Nucl Med Mol, Vol 43, S150
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84.
The impact of using tube-current-modulation technique for attenuation correction of PET/CT images on image quality and patient dose
Y. Salimi, P. Ghafarian, M. Deevband, M. Bakhshayesh Karam, H.Jamaati, M.R. Ay
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European Association of Nuclear Medicine Annual Congress,15-19 October 2016, Barcelona, Spain, Eur J Nucl Med Mol, Vol 43, S525
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85.
Effect of TOF and PSF in detection of lymph node metastases in head and neck of PET/CT images
P Ghafarian, A Ketabi, A Doroudinia, M Bakhshayesh Karam, MR Ay
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European Journal of Nuclear Medicine and Molecular Imaging,2016, Vol 43,S507-S507
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86.
The impact of using tube-current-modulation technique for attenuation correction of PET/CT images on image quality and patient dose
Y Salimi, P Ghafarian, M Deevband, M Bakhshayesh Karam, H Jamaati, M Ay
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EUROPEAN JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING
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87.
Breast-dedicated PET scanner based on partial geometry
Emami, H. Ghadiri, P. Ghafarian, P. Geramifar, M.R. Ay
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European Association of Nuclear Medicine Annual Congress, 15-19 october 2016, Barcelona, spain, Eur J Nucl Med Mol, Vol 43, S93
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88.
The influence of TOF and PSF techniques along with scan duration on respiratory artefact reduction in PET/CT images
P Ghafarian, R Sharif Pour, A Doroudinia, M Bakhshayesh Karam, MR Ay
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EUROPEAN JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING,2016
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89.
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
M. Shandiz, H. Saligeh Rad, P. Ghafarian, M. Bakhshaysh Karam and M.R. Ay
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Ann Nucl Med. 2016 Sep 28
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Abstract:
PURPOSE:
Prostate imaging is one of the major application of hybrid PET/MRI systems. Inaccurate attenuation maps (µ-maps) derived by direct segmentation (SEG) in which the cortical bone is ignored and the volume of the air in cavities is underestimated is the main challenge of commercial PET/MRI systems for the quantitative analysis of the pelvic region. The present study considered the cortical bone and air cavity along with soft tissue, fat, and background air in the µ-map of the pelvic region using a method based on SEG. The proposed method uses a dedicated imaging technique that increases the contrast between regions and a hybrid segmentation method to classify MR images based on intensity and morphologic characteristics of tissues, such as symmetry and similarity of bony structures.
PROCEDURES:
Ten healthy volunteers underwent MRI and ultra-low dose CT imaging. The dedicated MR imaging technique uses the short echo time (STE) based on the conventional sequencing implemented on a clinical 1.5T MRI scanner. The generation of a µ-map comprises the following steps: (1) bias field correction; (2) hybrid segmentation (HSEG), including segmenting images into clusters of cortical bone-air, soft tissue, and fat using spatial fuzzy c-means (SFCM), and separation of cortical bone and internal air cavities using morphologic characteristics; (3) the active contour approach for the separation of background air; and (4) the generation of a five-class μ-map for cortical bone, internal air cavity, soft tissue, fat tissue, and background air. Validation was done by comparison with segmented CT images.
RESULTS:
The Dice and sensitivity metrics of cortical bone structures and internal air cavities were 72 ± 11 and 66 ± 13 and 73 ± 10 and 68 ± 20 %, respectively. High correlation was observed between CT and HSEG-based µ-maps (R 2 > 0.99) and the corresponding sinograms (R 2 > 0.98).
CONCLUSIONS:
Currently, pelvis µ-maps provided by the current PET/MRI systems and the ultra-short echo time and atlas-based methods tend to be inaccurate. The proposed method acceptably generated a five-class μ-map using only one image.
KEYWORDS:
MRI-base attenuation correction; Morphologic characteristics-based segmentation; PET/MRI; Prostate imaging; STE pulse sequence
90.
Design and development of a dedicated portable gamma camera system for intra-operative imaging
S. Kaviani, N. Zeraatkar, S. Sajedi, A. Akbarzadeh, N. Gorjizadeh, M. H. Farahani, B. Teimourian, P. Ghafarian, H. Sabet and M.R. Ay
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Phys Med. 2016 Jul;32(7):889-97. doi: 10.1016/j.ejmp.2016.06.004. Epub 2016 Jun 23
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Abstract
PURPOSE:
We developed a high performance portable gamma camera platform dedicated to identification of sentinel lymph nodes (SLNs) and radio-guided surgery for cancer patients. In this work, we present the performance characteristics of SURGEOSIGHT-I, the first version of this platform that can intra-operatively provide high-resolution images of the surveyed areas.
METHODS:
At the heart of this camera, there is a 43×43 array of pixelated sodium-activated cesium iodide (CsI(Na)) scintillation crystal with 1×1mm(2) pixel size and 5mm thickness coupled to a Hamamatsu H8500 flat-panel multi-anode (64 channels) photomultiplier tube. The probe is equipped with a hexagonal parallel-hole lead collimator with 1.2mm holes. The detector, collimator, and the associated front-end electronics are encapsulated in a common housing referred to as head.
RESULTS:
Our results show a count rate of ∼41kcps for 20% count loss. The extrinsic energy resolution was measured as 20.6% at 140keV. The spatial resolution and the sensitivity of the system on the collimator surface was measured as 2.2mm and 142cps/MBq, respectively. In addition, the integral and differential uniformity, after uniformity correction, in useful field-of-view (UFOV) were measured 4.5% and 4.6%, respectively.
CONCLUSIONS:
This system can be used for a number of clinical applications including SLN biopsy and radiopharmaceutical-guided surgery.
Keywords:
Sentinel lymph node (SLN), Lymphoscintigraphy, SURGEOSIGHT-I, Breast cancer, Intra-operative gamma camera
91.
Evaluation of staff and environment exposure from 18-F-FDG at the first PET/T and cyclotron center in Iran
S. Zargan, P. Ghafarian, A. Shabestani Monfared, A. A. Sharafi, M. Bakhshayeshkaram and M. R. Ay
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14th Iranian Congress of Radiographic Science Association, Tehran, Iran, 2016, p 69-70
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Nominated as one of the best submitted abstract
92.
Reduction of Respiratory Induced Artefact in PET/CT Images using TOF Reconstruction
R. Sharif Pour, P. Ghafarian, A. Doroudinia, M. Bakhshayesh Karam and M. R. Ay
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|
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American College of Nuclear Medicine annual meeting- SNMMI mid-winter meeting, Jan 2016, Orlando, Florida
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93.
Acceptance Test of the first Hospital Cyclotron for Production of PET tracers in Iran
P. Ghafarian, S. M. Khamesi1, M. R. Golrokh Nodehi and M. R. Ay
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World Congress on Medical Physics & Biomedical Engineering, 7-12 June 2015, Toronto, Canada, p 518
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94.
Can Pacemaker and ICD degrade CT-Based Attenuation Corrected cardiac SPECT images?
Z. Etemadi, A. Bitaran Rajabi, H. Malek, P. Ghafarian, N. Zeraatkar and M. R. Ay
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World Congress on Medical Physics & Biomedical Engineering, 7-12 June 2015, Toronto, Canada, p 132
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95.
Correction of Metal Artefacts Induced from Pacemaker and ICD Leads in CT-Based Attenuation Correction of Cardiac SPECT data
M. R. Ay, Z. Etemadi, A. Bitarafan-Rajabi, H. Malek, N. Zeraatkar and P. Ghafarian
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World Congress on Medical Physics & Biomedical Engineering, 7-12 June 2015, Toronto, Canada, p 522
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96.
Generating a four-class attenuation map for MR-based attenuation correction of PET data in pelvis region using an automatic segmentation protocol
H. Saligheh Rad, M. Shirin Shandiz, P. Ghafarian, M. H. Arabi, M. Bakhshayeshkaram, N. Shafiei and M. R. Ay
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World Congress on Medical Physics & Biomedical Engineering, 7-12 June 2015, Toronto, Canada, p 201
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97.
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
P. Khateri, H. Saligheh Rad, A. Homayoun Jafari, A. Fathi, A. Akbarzadeh, M. Shojae Moghadam, A. Aryan, P. Ghafarian and M. R. Ay
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World Congress on Medical Physics & Biomedical Engineering, 7-12 June 2015, Toronto, Canada, p 371
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98.
Impact of Point spread function modeling on tumor quantification in clinical PET/CT imaging
S. Ahangari1, P. Ghafarian, M. Bakhshayeshkaram and M. R. Ay
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World Congress on Medical Physics & Biomedical Engineering, 7-12 June 2015, Toronto, Canada, p 133
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99.
Measurement of Photon and Neutron Dose Distribution in Cyclotron Bunker During F18 and N13 Production
P. Ghafarian, S. M. Khamesi, M. R. Golrokh Nodehi and M. R. Ay
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World Congress on Medical Physics & Biomedical Engineering, 7-12 June 2015, Toronto, Canada, p 606
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100.
The Impact of time of flight algorithm and PSF modeling on standard uptake value in clinical PET/CT imaging
M. Shekari, P. Ghafarian, M. Bakhshayeshkaram and M. R. Ay
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World Congress on Medical Physics & Biomedical Engineering, 7-12 June 2015, Toronto, Canada, p 132
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101.
TLD Measurement of Absorbed Dose of Workers in PET/CT Department
P. Ghafarian, S. Zargan, A. Shabestani Monfared, A. A. Sharafi, M. Bakhshayeshkaram and M. R. Ay
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World Congress on Medical Physics & Biomedical Engineering, 7-12 June 2015, Toronto, Canada, p109
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102.
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
P. Khateri, H. Saligheh Rad, A. H. Jafari, A. Fathi Kazerooni, A. Akbarzadeh, M. Shojae Moghadam, A. Aryan, P. Ghafarian, M. R. Ay
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Molecular Imaging & Biology, 2015, Vol. 17, No.6, pp 884-892
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103.
Optimizing Image Reconstruction Parameters in Time of Flight PET/CT Imaging: a Phantom Study
M. Shekari, P. Ghafarian, S. Ahangari, H. Ghadiri, M. Bakhshayeshkaram and M.R. Ay
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Frontiers in Biomedical Technologies, 2015, Vol. 2, No. 3, pp 146-154
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104.
Performance evaluation of the first Hospital Cyclotron installed in masih daneshvari hospital for Production of positron emitter
P. Ghafarian, S. M. Khamesi1 and M. R. Golrokh Nodehi
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Iranian journal of physics research (IJPR ), 2015, Vol.15, No. 2, pp 269-277
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105.
The Impact of Point Spread Function Modeling on Scan Duration in PET Imaging
S. Ahangari, P. Ghafarian, M. Shekari, H. Ghadiri, M. Bakhshayeshkaram and M.R. Ay
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Frontiers in Biomedical Technologies, 2015, Vol. 2, No. 3, pp 137-145
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106.
A hybrid method for generation of attenuation map for MR-based attenuation correction of PET data in prostate PET/MR imaging
M. Shirin Shandiz, M.H. Arabi, P. Ghafarian, M. Bakhshayesh Karam, H.R. Salighe Rad and M.R. Ay
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3rd Conference on PET/MR and SPECT/MR, 19-21 May 2014, Kos Island, Greece
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107.
A hybrid method for generation of attenuation map for MR-based attenuation correction of PET data in prostate PET/MR imaging
M. Shirin Shandiz, M.H. Arabi, P. Ghafarian, M. Bakhshayesh Karam, H.R. Salighe Rad and M.R. Ay
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EJNMMI Physics 2014, 1(Suppl 1): A77
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108.
A Hybrid Method for Separation of Bone and Air in Pelvic Region of MRI images for Attenuation Correction of PET/MR images
M. Shirin Shandiz, M. H. Arabi, P. Ghafarian, M. Bakhshayeshkaram, H. R. Saligherad and M. R. Ay
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11th Conference of Iranian Medical Physics, Tehran, Iran, 2014, p 283
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109.
A Report on Acceptance Test of GE PET Trace 700 Self-Shield Cyclotron Installed in Masih Daneshvari Hospital
P. Ghafarian
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|
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18th Iranian Congress of Nuclear Medicine, Tehran, Iran, 2014, p 65
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110.
Design and Development of a High Resolution Animal SPECT Scanner Dedicated for Rat and Mouse Imaging
S. Sajedi , N. Zeraatkar, V. Moji, M. H. Farahani, S. Sarkar, H. Arabi, B. Teymoorian, P. Ghafarian, A. Rahmim and M.R. Ay
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Nuclear. Instrumentation Methods in Physics Research A, 2014, Vol. 741, pp 169-176
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111.
Evaluation of Acquisition Parameters with Short Echo for Improvement of Bone Signal versus Air Signal for Better Separation of Bone and Air in Attenuation Correction of Clinical PET/MR images
M. Shirin Shandiz, M. H. Arabi, P. Ghafarian, M. Bakhshayeshkaram, H. R. Saligherad and M. R. Ay
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11th Conference of Iranian Medical Physics, Tehran, Iran, 2014, p 284
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112.
Evaluation of Resolution Recovery in Quantitative of Clinical PET/CT Images
S. Ahangari, P. Ghafarian, M. Bakhshayeshkaram and M. R. Ay
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11th Conference of Iranian Medical Physics, Tehran, Iran, 2014, p 274
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113.
Experimental Measurement of Absorbed Dose using TLD for Radiation Workers in PET/CT Department
S. Zargan, A. Shabestari Monfared, P. Ghafarian, A. A. Sharafi, M. Bakhshayeshkaram and M. R. Ay
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18th Iranian Congress of Nuclear Medicine, Tehran, Iran, 2014, p 157
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114.
Measurement of Staff Dose and Environment Dose by TLD Dosimeter in PET/CT and Cyclotron Centre of Masih Daneshvari Hospital
S. Zargan, A. Shabestari Monfared, P. Ghafarian, A. A. Sharafi, , M. Bakhshayeshkaram and M. R. Ay
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|
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11th Conference of Iranian Medical Physics, Tehran, Iran, 2014, p 399
|
115.
Optimazation the Acquisition Time in Whole-Body PET/CT Imaging
S. Ahangari, P. Ghafarian, M. Shekari, M. Bakhshayeshkaram and M. R. Ay
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18th Iranian Congress of Nuclear Medicine, Tehran, Iran, 2014, p 75
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116.
Optimization of Acquisition Time Regarding to Image Quality and Quantitative Analysis
S. Ahangari, P. Ghafarian, M. Bakhshayeshkaram and M. R. Ay
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11th Conference of Iranian Medical Physics, Tehran, Iran, 2014, p 319
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117.
Performance evaluation of a newly developed high-resolution, dual-head animal SPECT system based on the NEMA NU1-2007 standard
V. Moji, N. Zeraatkar, M.H. Farahani, M.R. Aghamiri, S. Sajedi, B. Teimourian, P. Ghafarian, S. Sarkar and M.R Ay
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Journal of Applied Clinical Medical Physics, 2014, Vol. 15, No.6, pp 267-278
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118.
Performance Evaluation of Bone Mineral Densitometry Techniques by a Novel Phantom
A. Emami, H. Ghadiri and P. Ghafarian
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|
|
Frontiers in Biomedical Technologies, 2014, Vol.1, No.4, pp 271-278
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119.
Quantification of PET and CT Misalignment Errors Due to Bulk Motion in Cardiac PET/CT Imaging: Phantom and Clinical Studies
P. Ghafarian, M .R. Ay, A. Fard-Esfahani, A. Rahmim and H. Zaidi
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Frontiers in Biomedical Technologies, 2014, Vol.1, No.3,pp 159-167
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120.
Resolution-recovery-embedded image reconstruction for a high-resolution animal SPECT system
N. Zeraatkar, S. Sajedi, M.H. Farahani, H. Arabi, S. Sarkar, P. Ghafarian, A. Rahmim and M.R. Ay
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Physica Medica, 2014, Vol. 30, No.7, pp 774-781
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121.
The Calculation of Photon and Neutron Dose Rate inside The Cyclotron Bunker During The Bombardment of F18 and N13 Targets in GE PET Trace 700 Self-Shield Cyclotron
P. Ghafarian and S. M. Khamesi
|
|
|
18th Iranian Congress of Nuclear Medicine, Tehran, Iran, 2014, p 81
|
122.
The Effect of Respiratory Motion on different Lung Tumours Size and Uptake Value in PET/CT images
H. Soufi, P. Ghafarian and S. M. R. Aghamiri
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|
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11th Conference of Iranian Medical Physics, Tehran, Iran, 2014, p 343
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123.
The Effect of TOF Technique on Acquisition Time in PET/CT Imaging
M. Shekari, P. Ghafarian, M. Bakhshayeshkaram and M. R. Ay
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|
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11th Conference of Iranian Medical Physics, Tehran, Iran, 2014, p 286
|
124.
The Influence of PET and CT Misalignment due to Respiratory Motion on the Cardiac PET/CT Imaging: a Simulation Study
P. Ghafarian and M .R. Ay
|
|
|
Frontiers in Biomedical Technologies, 2014, Vol.1, No.4, pp 252-257
|
125.
Performance Evaluation of the First Hospital Cyclotron Installed in Masih Daneshvari Hospital for Production of Positron Emitter Radioisotopes
P. Ghafarian ,M. Kohanpour, S.M. Khamesi and M.R. Golrokh Nodehi
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|
|
1st National Conference on Particle Accelerators & Their Application,27-28 November 2013-Tehran-Amir Kabir University, p.7
|
126.
The Calculation of Neutron and Photon Dose Rate as a Function of Distance and Target Current during Flourin-18 Production in PET Trace 700 Self Shield Cyclotron Installed in Masih Daneshvari Hospital
P. Ghafarian , M.R. Golrokh Nodehi and S.M. Khamesi
|
|
|
1st National Conference on Particle Accelerators & Their Application,27-28 November 2013-Tehran-Amir Kabir University, p.53
|
127.
The Influence of Misalignment Artifact Due to Global and Respiratory Motion on Interpretation of Cardiac PET/CT Examination: Clinical and Phantom Studies"
P. Ghafarian and M. R. Ay
|
|
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European Association of Nuclear Medicine Annual Congress, 19-23 October 2013, Lyon, France. Eur J Nucl Med Mol, , Vol 20, Issue 2
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128.
The Influence of Respiratory Motion Induced Artifacts on SUV Calculation in Lung PET/CT Imaging
H. Soufi, P. Ghafarian and S.M.R Aghamiri
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European Association of Nuclear Medicine Annual Congress, 19-23 October 2013, Lyon, France. Eur J Nucl Med Mol, , Vol 20, Issue 2
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129.
Experimental assessment of the influence of beam hardening filters on image quality and patient dose in volumetric 64-slice x-ray CT scanners
M. R. Ay, A. Mehranian, A. Maleki, H. Ghadiri, P. Ghafarian and H. Zaidi
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|
|
Phys Med , 2013, Vol. 29, pp. 249-260
|
130.
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
P. Geramifar, M. Shamsaie Zafarghandi, P. Ghafarian, A. Rahmim and M. R. Ay
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|
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Molecular Imaging & Biology, 2013, Vol. 15, No. 6, pp 655-665
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131.
An Innovative Rotation-Based Iterative Resolution Recovery for HiReSPECT™: a Dedicated Small Animal SPECT System
N. Zeraatkar, M. H. Farahani, H. Arabi, S. Sarkar, S. Sajedi, N. Naderi, P. Ghafarian, A. Rahmim and M.R. Ay
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European Association of Nuclear Medicine Annual Congress, 27-31 October 2012, Milan, Italy. Eur J Nucl Med Mol, S386-S387
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132.
Design and development of a high resolution small animal imaging system for mice and rat
M. R. Ay, H. Arabi, M. H. Farahani, N. Zeraatkar, S. Sarkar, S. Sajedi, N. Naderi Rastegar and P. Ghafarian
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European Association of Nuclear Medicine Annual Congress, 27-31 October 2012, Milan, Itly. Eur J Nucl Med Mol, S441
|
133.
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
M. Sedighpoor, P. Ghafarian, A. Emami, M. R. Ay
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European Association of Nuclear Medicine Annual Congress, 27-31 October 2012, Milan, Itly. Eur J Nucl Med Mol, S515
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134.
Quantification and Correction of Metallic Artifacts Arising from Implantable Cardiac Pacing Devices in PET/CT Studies: A Phantom Study
M. R. Ay, A. Mehranian, P. Ghafarian ,M. Abdoli and H.Zaidi
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|
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European Association of Nuclear Medicine Annual Congress, 27-31 October 2012, Milan, Itly. Eur J Nucl Med Mol, S20
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135.
SurgeoSight TM: An intraoperative hand held Gamma camera for precise localization of sentine lymph nodes
M. R. Ay, H. Arabi, M. H. Farahani, N. Zeraatkar, S. Sarkar, S. Sajedi, N. Naderi Rastegar and P. Ghafarian
|
|
|
European Association of Nuclear Medicine Annual Congress, 27-31 October 2012, Milan, Itly. Eur J Nucl Med Mol, S385
|
136.
A novel energy mapping approach for CT-based attenuation correction in PET
B. Teimourian , M. R. Ay, M. Shamsaei-Zafarghandi, P. Ghafarian, H. Ghadiri and H. Zaidi
|
|
|
Med Phys 2012, Vol. 39, No. 4, pp 2078-2089
|
137.
High resolution small animal SPECT: HiReSPECT for preclinical imaging
H. Arabi, M. H. Farahani, N. Zeraatkar, S. Sarkar, S. Sajedi, A. Rahmim, P. Ghafarian and M. R. Ay
|
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|
Proc. Asia Oceania Congress of Nucl. Med. & Biology, vol. 20 (suppl. 1), p. 93, 2012
|
138.
QCT technique optimization by dual energy CT
Emami, H. Ghadiri, P. Ghafarian and M. R. Ay
|
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|
Proc. Asia Oceania Congress of Nucl. Med. & Biology, vol. 20 (suppl. 1), p. 125, 2012
|
139.
Quantification of the influence of respiratory motion induced misalignment between PET and CT data on diagnosis of heart disease in cardiac PET/CT imaging
M. Sedigpoor, M. R. Ay, P. Ghafarian, P. Farnia
|
|
|
Proc. Asia Oceania Congress of Nucl. Med. & Biology, vol. 20 (suppl. 1), p. 129, 2012
|
140.
The influence of metallic artefact reduction on the accuracy of attenuation map generation in cardiac PET/CT imaging
P. Ghafarian
|
|
|
Proc. Asia Oceania Congress of Nucl. Med. & Biology, vol. 20 (suppl. 1), p. 121, 2012
|
141.
The influence of PET and CT data misalignment in cardiac PET/CT examination: an analytic simulation
P. Ghafarian
|
|
|
Proc. Asia Oceania Congress of Nucl. Med. & Biology, vol. 20 (suppl. 1), p. 120-121, 2012
|
142.
A New Phantom for Performance Evaluation of Bone Mineral Densitometry Using DEXA and QCT
Emami, H. Ghadiri, M.R. Ay, S. Akhlagpour, A. Eslami, P. Ghafarian and S. Taghizadeh
|
|
|
IEEE Nuclear Science Symposium & Medical Imaging Conference, Valencia, Spain, 23-29 October 2011, p. 3441-3445
|
143.
Characterization of scattered radiation profile in volumetric 64-slice x-ray CT scanner: A Monte Carlo study
Najafi Darmian A, M.R. Ay, Ghafarian P, Pouladian M, Shirazi A, Ghadiri H, Akbarzadeh A and Zaidi H
|
|
|
IEEE Nuclear Science Symposium & Medical Imaging Conference, Valencia, Spain, 23-29 October 2011, p. 2692–2696
|
144.
A Novel Phantom for Accurate Performance Assessment of Bone Mineral Measurement Techniques: DEXA and QCT
Emami, H. Ghadiri, M.R. Ay, S. Akhlagpour, A. Eslami, P. Ghafarian and S. Taghizadeh
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|
|
5th Kuala Lumpur International Conference on Biomedical Engineering, 20-23 June 2011, Kuala Lumpur, Malaysia, IFMBE Proceedings 35, p. 47-50
|
145.
Correction of contrast agent induced srtifacts in CT-based attenuation correction of cardiac PET data using a semi-automated segmentation algorithm
P. Ghafarian, M.R. Ay and J. Hassani
|
|
|
3th International Congress of Nuclear Medicine, Tehran, Iran, 2011, pp 110
|
146.
Is percentage error of bone density determined by DEXA technique influenced by density?
Emami, H. Ghadiri, M.R. Ay, S. Akhlagpour, P. Ghafarian and S. Taghizadeh
|
|
|
3th International Congress of Nuclear Medicine, Tehran, Iran, 2011, pp 88
|
147.
Monte Carlo-based evaluation of inter-crystal scatter and penetration in the PET subsystem of three GE Discovery PET/CT scanners
N. Zeraatkar, M. R. Ay, P. Ghafarian, S. Sarkar, P. Geramifar, and A. Rahmim
|
|
|
Nuclear. Instrumentation Methods in Physics Research A, 2011, Vol. 659, pp. 508-514
|
148.
Qualitative and quantitative assessment of metal artefacts arising from implantable cardiac pacing devices in oncological PET/CT studies: A phantom study
M.R. Ay, A. Mehranian, M. Abdoli, P. Ghafarian and H. Zaidi
|
|
|
Molecular Imaging & Biology, 2011, Vol. 13, pp. 1077-1088
|
149.
Assessment of the Influence of PET and CT Data Misalignment Errors in Cardiac PET/CT Examination: Patient and Phantom Studies
P. Ghafarian, S.M.R. Aghamiri, M.R. Ay, A. Fard Esfahani and H. Zaidi
|
|
|
The International Congress of Nuclear Medicine, Mashhad, Iran, Iranian Journal of Nuclear Medicine, Vol. 18, Supp. 1, 2010, pp. 81
|
150.
Coronary calcium score scan-based attenuation correction in cardiovascular PET imaging
P. Ghafarian, S.M.R. Aghamiri, M.R. Ay, B. Fallahi, A. Rahmim, T. Schindler, O. Ratib and H. Zaidi
|
|
|
Nuclear Medicine Communication, 2010, Vol. 31, No 9, pp 780-787
|
151.
Coronary Calcium Score Scan-Based Attenuation Correction in Viability PET Examination: A Feasibility Study
P. Ghafarian, S.M.R. Aghamiri, M.R. Ay, B. Fallahi, A. Rahmim, T. Schindler, O. Ratib and H. Zaidi
|
|
|
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
|
Nominated as one of the best submitted abstracts
152.
Impact of Metal Artifact Reduction on Cardiac FDG-PET/CT Studies in the Presence of Pacemaker and Implantable Cardio Verter Defibrillator leads
P. Ghafarian, S.M.R. Aghamiri, M.R. Ay, B. Fallahi, A. Rahmim, T. Schindler, O. Ratib and H. Zaidi
|
|
|
International Congress of Nuclear Medicine, Mashhad, 2010, Iranian Journal of Nuclear Medicine, Vol. 18, Supp. 1, 2010, pp. 104
|
153.
Is Metal Artifact Reduction Mandatory in Cardiac PET/CT Imaging in the Presence of Pacemaker and Implantable Cardioverter Defibrillator leads?
P. Ghafarian, S.M.R. Aghamiri, M.R. Ay, A. Rahmim, T. Schindler, O. Ratib and H. Zaidi
|
|
|
European Journal of Nuclear Medicine and Molecular Imaging, 2010, Vol. 38, pp 252–262
|
154.
Quantification and Correction of Metallic Artifact Arising from Implantable cardiac Pacing Devices in PET/CT Studies: A Phantom Study
M.R. Ay, A. Mehranian, P. Ghafarian, M. Abdoli and H. Zaidi
|
|
|
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
155.
CT Based Attenuation Correction in Cardiac PET/CT Using Calcium Score CT Image: A Feasibility Study
P. Ghafarian, S.M.R. Aghamiri, M.R. Ay, A. Rahmim and H. Zaidi
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International Congress of Nuclear Medicine and Molecular Imaging, Tabriz, Iran, 23-25 September, 2009, pp. 9
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156.
Quantification of PET and CT Data Misalignment Errors in Cardiac PET/CT: Clinical and Phantom Studies
P. Ghafarian and S.M.R. Aghamiri, M.R. Ay, A. Rahmim and H. Zaidi
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The 3rd International Conference on Bioinformatics and Biomedical Engineering (IEEE iCBBE 2009), June 11th to 13th, 2009, 1-4, Beijing, China
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157.
The Influence of X-ray Spectra Filtration on Image Quality and Patient Dose in the GE VCT 64-Slice Cardiac CT Scanner
M.R. Ay, A. Maleki, H. Ghadiri, P. Ghafarian, A. Ahmadian and H. Zaidi
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The 3rd International Conference on Bioinformatics and Biomedical Engineering (IEEE iCBBE 2009), June 11th to 13th, 2009, 1-4, Beijing, China
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158.
Reduction of Intravenous Contrast Related Artifacts in CT-based Attenuation Corrected PET Images
M.R. Ay, J.H. Bidgoli, P. Ghafarian and H. Zaidi
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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
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159.
MCNP4C-based Monte Carlo study of grid performance in diagnostic radiology
P. Ghafarian, A.A. Sharafi, K. Keshavarz
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Iranian Journal of Medical Physics, 2008, Vol 3, Issue 13, 41-48
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Abstract:
Introduction:
In diagnostic radiology, the presence of scattered photons effectively decreases the image quality. The introduction of grid has great impact on the improvement of image contrast and as a result on the image quality. A detailed knowledge of scattered radiation distribution is necessary to optimize grid design.
Materials and Methods:
In this work, the Monte Carlo Method (MCNP4C code) was used for the calculation of scattered radiation distribution and scatter to primary ratio (SPR). So the variation in the phantom thickness, field size, tube voltage and aluminium filter are considered. Thereafter, the contribution of grid parameters such as strip density, grid ratio, interspace material and lead-to-interspace ratio, height of strip, thickness of strip and thickness of interspace on scatter rejection was investigated by the calculation of bucky factor and contrast improvement factor in 108 linear parallel grids under standard conditions proposed by International Electrotechnical Commission. Full simulation of photon interactions has been considered for the evaluation of aluminium grids and cotton fiber as interspace material. The simulation of x-ray spectra and photon transport in materials was validated by comparing it to the measured data.
Results:
An increase of 15% in SPR for tube voltage between 40 and 140 kV was obtained in a standard phantom whereas an increase of 99% was observed for phantom thicknesses between 3 and 40 cm at 120 kV. It has been shown that in grids with similar strip density, both contrast improvement factor and bucky factor increase with increasing grid ratio. The same behavior was observed for grids with similar grid ratio when strip density are decreased.
Discussion and Conclusion:
The grids with cotton fiber show better performance than aluminium interspace grids with the same grid parameters especially in low strip density and high grid ratio. Likewise, the grids with high strip density and high grid ratio perform better than low strip density ones.
Keyword(s):
PARALLEL GRID, MONTE CARLO METHOD, MCNP4C, SCATTERED RADIATION
160.
A hybrid approach for fast simulation of x-ray computed tomography
M.R. Ay, P. Ghafarian and H. Zaidi
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Proceedings of IEEE Nuclear Science Symposium & Medical Imaging Conference, Honolulu, Hawaii, 28 October – 3 November 2007 Vol 5; pp. 3155-3160
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161.
Impact of x-ray tube voltage, field size and phantom thickness on scattered radiation in diagnostic radiology: A Monte Carlo investigation
P. Ghafarian, M.R. Ay, H. Ghadiri, S. Sarkar and H. Zaidi
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Proceedings of IEEE Nuclear Science Symposium & Medical Imaging Conference, Honolulu, Hawaii, 28 October – 3 November 2007 , Vol 5; pp. 3542-3547
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162.
The influence of energy indexing algorithm and electron substeps on MCNP4C electron transport: Application to simulation of x-ray spectra in diagnostic radiology and mammography
M.R. Ay, H. Ghadiri, P. Ghafarian, S. Sarkar and H. Zaidi
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Proceedings of IEEE Nuclear Science Symposium & Medical Imaging Conference, Honolulu, Hawaii, 28 October – 3 November 2007, Vol 5; pp. 4006-4011
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163.
MCNP4C-based Monte Carlo study of grid performance in diagnostic radiology
P. Ghafarian , Sharafi AA, Keshvarz K and Zaidi H
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Proceedings of the 14th International Conference of Medical Physics, Nuremberg, Germany, September 14-17, 2005, Biomedizinische Technik Vol. 50, Suppl, part 1, pp 1098-1099
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164.
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
M.R. Ay, S. Sarkar, M. Shahriari, and P. Ghafarian
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In 2th International Conference on Nuclear Science and Technology in Iran. Shiraz, Iran, 27-30 April 2004, p. 46
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165.
Measurement of Organ Dose in Abdomen-Pelvis CT Exam as a Function of mA, KVp and Scanner Type by Monte Carlo Method
M.R. Ay, S. Sarkar, M. Shahriari and P. Ghafarian
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Iranian J. of Radiation Research, 1(4), 187-194, 2004
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166.
Measurement of organ dose in abdomen-pelvis CT exams as a function of mA, KVp and scanner type by Monte Carlo method
M.R. Ay, M. Shahriari, S. Sarkar, and P. Ghafarian
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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
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