폴리스티렌 팬톰의 Scaling factor에 관한 연구

Abstract

Authors have measured the output and percent depth dose(PDI) of 4MV and 10MV photon beams in polystyrene phantom to determine the scaling factor of that phantom. Output could he calculated with the TG -21 protocol and the results shows good agreements with those from water phantom(-1.4% for 4MV and 0.6% for 10MV.) And PDD's did not show significant differences between the data from wafter and those from polystyrene phantom.(0.998 for 4MV and 0.977 for 10MV) These results show scaling factors need not to be applied for polystyrene phantom for 4MV and 10MV beams, while TG -21 protocol recommends scaling rackers 0.99 for 4MV, and 1.00 for 10MV photon beams.

Authors have measured the output and percent depth dose(PDI) of 4MV and 10MV photon beams in polystyrene phantom to determine the scaling factor of that phantom. Output could he calculated with the TG -21 protocol and the results shows good agreements with those from water phantom(-1.4% for 4MV and 0.6% for 10MV.) And PDD's did not show significant differences between the data from wafter and those from polystyrene phantom.(0.998 for 4MV and 0.977 for 10MV) These results show scaling factors need not to be applied for polystyrene phantom for 4MV and 10MV beams, while TG -21 protocol recommends scaling rackers 0.99 for 4MV, and 1.00 for 10MV photon beams.