Progress in Medical Physics (한국의학물리학회지:의학물리)
- Volume 12 Issue 2
- /
- Pages.147-153
- /
- 2001
- /
- 2508-4445(pISSN)
- /
- 2508-4453(eISSN)
A study on the dose distribution for total-body & hemibody irradiation using clinical photon beams
광자선을 이용한 전신 및 반신조사의 선량분포에 관한 고찰
Abstract
We have discussed that the total body irradiation(TBI) dose distribution of 6 and 10 MV photon beams, also differences between calculation dose use of compensator sheet and measurements in humanoid phantom. Total body irradiation and hemi-body irradiation(HBI) can be effectively performed when uniformity of dose distribution is estabilished. The method of TBI and HBI dosimatry requires special considerations related to technique, long distance and very large field, machine parameter, patient positioning. TBI and HBI with megavoltage photon beams requires basic dosimatric data which have to be measured directly or derived from the standard beam data. The semiconductor detector and ion chamber were positioned at a dmax depth, mid depth, and its specific ratio was determined using a scanning data by RFA-7 3-dimensional water phantom and solid phantom. The effective source axis distance 380 cm, the field size from 120 cm to 152 cm, isodose distributions were analyzed as a function of the thickness in phantom. Also, have discussed that the measurement of basic data for clinical photon beams for dosage calculations, data calculation sheet and the use of tissue compensation to improve dose uniformity. We have improved a dose uniformity in the TBI and HBI method.
방사선 전신 및 반신 조사방법을 방사선치료에 적용하여 균일한 선량 분포를 유도하고자 조사거리에서 선량측정, 조직결손에 따른 보상과 선량 보정 방법을 논의하였다. 의료용 선형가속기에서 발생된 6MV 광자선을 이용한 전신 조사시의 흡수선량을 결정하는, 선원과 조사면사이의 거리 변화에 따른 계산자료를 조사면의 중심축에서 고체 팬톰, RFA-7 물팬톰(Scanditronix, Sweden)에 대해 UNIDOS 전리함(PTW, Germany), THERADOS 전리함(Scanditronix, Sweden)을 이용한 측정으로 그 크기를 결정하였다. 조직보상체는 연판과 아크릴판을 이용하였다. 전신조사의 조건은 선원으로부터 380 cm의 거리에서 120