CAJ | 학술논문

目的探讨Elekta Precise直线加速器新型全碳素纤维治疗床床板对放疗剂量的影响.方法应用等中心技术( SAD)测量,设2组射野,均为等中心对穿野(一组穿过床板,另一组不穿过床板),用PTW剂量仪0.6 cm3 Farmer电离室比对测量,计算出治疗床主床板、体部延长板、头颈肩延长板不同位置及其衔接处对放疗剂量的衰减.结果 6 MV能量时,治疗床主床板对剂量的衰减为1.4％～ 7.2％,主床板衔接头1、4、7和8 cm处对剂量的衰减分别为2.8％～38.7％、1.4％～30.1％、1.5％～20.8％和1.4％～11.2％；体部延长板对剂量的衰减为0.5％～5.0％,体部延长板衔接头1cm位置对剂量的衰减为4.7％～15.4％；头颈肩延长板颈部位置对剂量的衰减在0.5％～3.3％,头颈肩延长板肩部位置对剂量的衰减在5.3％～l6.7％；延长板和主床板衔接处对剂量的衰减在6.8％～30.4％.结论新型全碳素纤维治疗床床板不同部位对剂量衰减不同,床板衔接部位标记区域对剂量衰减比较大.
목적 탐토Elekta Precise직선가속기신형전탄소섬유치료상상판대방료제량적영향.방법 응용등중심기술( SAD)측량,설2조사야,균위등중심대천야(일조천과상판,령일조불천과상판),용PTW제량의0.6 cm3 Farmer전리실비대측량,계산출치료상주상판、체부연장판、두경견연장판불동위치급기함접처대방료제량적쇠감.결과 6 MV능량시,치료상주상판대제량적쇠감위1.4％～ 7.2％,주상판함접두1、4、7화8 cm처대제량적쇠감분별위2.8％～38.7％、1.4％～30.1％、1.5％～20.8％화1.4％～11.2％；체부연장판대제량적쇠감위0.5％～5.0％,체부연장판함접두1cm위치대제량적쇠감위4.7％～15.4％；두경견연장판경부위치대제량적쇠감재0.5％～3.3％,두경견연장판견부위치대제량적쇠감재5.3％～l6.7％；연장판화주상판함접처대제량적쇠감재6.8％～30.4％.결론 신형전탄소섬유치료상상판불동부위대제량쇠감불동,상판함접부위표기구역대제량쇠감비교대.
Objective To investigate the dosimetric influence of pure carbon fiber treatment tabletop of Elekta Precise new linear accelerator in radiotherapy.Methods Surface-axis distance (SAD) technology was employed for the measurement.Two groups of fields were set and both of them were SAD opposed portals ( one of them went through the tabletop,while the other did not).A PTW electrometer and a 0.6 cm3 Farmer ionization chamber were utilized for comparison measurement.Then dose attenuation of the main table board,extended body board,the extended board for head,neck and shoulders,and the joints of these boards were calculated.Results Under the energy of 6 MV,the dose attenuations of the following locations were:1.4％ - 7.2％ at the main treatment table board; 2.8％ - 38.7％,1.4％ -30.1％,1.5％ -20.8％ and 1.4％ - 11.2％,respectively at distances of 1,4,7 and 8 cm from the joint of the main table board ;0.5％ - 5.0％ at the extended body board; 4.7％ - 15.4％ at distance of 1cm from the joint of the extended body board; 0.5％ -3.3％ at the neck position of the extended board for head,neck and shoulders; 5.3％ - 16.7％ at the shoulder positions; and 6.8％ -30.4％ at the joint between the extended boards and the main table board.Conclusions The dose attenuations of the new linear accelerator pure carbon fiber treatment tabletop vary at different locations. Considerable higher attenuations are observed at the table board joints than other locations.