1. Radiology and Nuclear Medicine Department, School of Paramedical Sciences, Kermanshah University of Medical Science, Kermanshah, Iran;
2. Department of Molecular Medicine, School of Advanced Technologies in Medicine, Tehran University of Medical Sciences, Tehran, Iran;
3. Department of Medical Physics and Biomedical Engineering, Faculty of Medicine, Tehran University of Medical Sciences, Tehran, Iran;
4. Department of Medical Physics, School of Medicine, Iran University of Medical Sciences, Tehran, Iran;
5. Science and Research Branch, Azad University, Tehran, Iran;
6. Department of Radiology, Faculty of Paramedical Sciences, Tehran University of Medical Sciences, Tehran, Iran