y.l. kim department of radiology, choonhae college of health science, ulsan 689-784, south korea t.s. suh department of radiology, choonhae college of health science, ulsan 689-784, south korea b.y. choe department of radiology, choonhae college of health science, ulsan 689-784, south korea b.o. choi department of radiation oncology, seoul st. mary’s hospital, the catholic university, seoul 137-701, south korea j.b. chung department of radiadion oncology, seoul national university bundang hospital, seongnam 463-707, south korea j.w. lee department of radiation oncology, konkuk university medical center, seoul 143-729, south korea

B.M. Park, B.O. Choi, B.Y. Choe, J.B. Chung, J.W. Lee, J.Y. Jung, T.S. Suh, Y.J. Shin, Y.K. Bae, Y.L. Kim,

Azizollah Rahimi Mansour Zabihzadeh Mozafar Naserpour, Sasan Razmjoo Sholeh Arvandi Syyed Mohammad Hoseini

sedigheh sina radiation research center, shiraz university, shiraz, ir iran reza faghihi radiation research center, shiraz university, shiraz, ir iran; department of nuclear engineering, shiraz university, shiraz, ir iran; radiation research center, shiraz university, shiraz, ir iran. tel: +98-7116473474, fax: +98-7116473474 ali soleimani meigooni department of nuclear engineering, shiraz university, shiraz, ir iran; comprehensive cancer center of nevada, las vegas, nevada, usa zahra siavashpour department of radiation medicine, shahid beheshti university, tehran, ir iran mohammad amin mosleh-shirazi center for research in medical physics and biomedical engineering, shiraz university of medical sciences, shiraz, ir iran; department of radiotherapy and oncology, shiraz university of medical sciences, shiraz, ir iran

Hassan Ali Nedaie, Mahbod Esfahani Nasibeh Kavousi Somayeh Gholami,

asghar mesbahi department ofmedical physics, medical school, tabriz university of medical sciences,,tabriz, iran. 2- department ofradiation oncology, imam hospital, tabriz, iran. ismail zergoug 3-department of radiotherapy, emir abdelkaderanti-cancer center, oran, algeria

hamid-reza sadoughi medical physics research center, medical physics department, faculty of medicine, mashhad university of medical sciences, mashhad, iran shahrokh nasseri medical physics research center, medical physics department, faculty of medicine, mashhad university of medical sciences, mashhad, iran mahdi momennezhad medical physics research center, medical physics department, faculty of medicine, mashhad university of medical sciences, mashhad, iran imam reza hospital, mashhad university of medical sciences, mashhad, iran hadi sadoghi-yazdi department of computer engineering, ferdowsi university of mashhad, mashhad, mohammad-hossein bahreyni-toosi medical physics research center, medical physics department, faculty of medicine, mashhad university of medical sciences, mashhad, iran