1. Medical Physics and Engineering Department, School of Medicine, Shiraz University of Medical Sciences, Shiraz 71348-14336, Iran
2. School of Medicine, Shiraz University of Medical Sciences, Shiraz 71348-14336, Iran
3. Radiology and Radiobiology Department, School of Paramedical Sciences, Shiraz University of Medical Sciences, Shiraz 71348-14336, Iran
4. Department of Medical Physics & Biomedical Engineering, School of Medicine, Tehran University of Medical Sciences, Tehran 19835-178, Iran
5. Nuclear Medicine Department, School of Medicine, Shiraz University of Medical Sciences, Shiraz 71348-14336, Iran
6. Department of Radiation Dosimetry, Nuclear Physics Institute of the CAS, 180 00 Prague, Czech Republic
7. Technische Universität Wien, Atominstitut, 1020 Vienna, Austria