中外健康文摘
中外健康文摘
중외건강문적
WORLD HEALTH DIGEST
2012年
37期
27-29
,共3页
医用加速器%全碳纤维%治疗床%剂量%穿透因子
醫用加速器%全碳纖維%治療床%劑量%穿透因子
의용가속기%전탄섬유%치료상%제량%천투인자
medical accelerator%all-carbon fiber treatment couch%radiotherapy dosage%penetration factor
目的探讨医科达Synergy型医用直线加速器全碳纤维治疗床对放疗剂量的影响.方法将标准固体水模置于治疗床上，使固体水模中轴与治疗床中心纵轴重合.改变加速器机架角度，从不同角度照射并用剂量仪进行比对测量，计算出全碳纤维治疗床及其延长板对放疗剂量的衰减因子.结果6MV能量时，全碳纤维主床体对剂量的衰减在1.9%~7.2%平均衰减5.0%；延长板对剂量的衰减在0.5%~4.4%平均衰减2.2%；延长板衔接处对剂量的衰减在3.9%~43.1%平均衰减9.0%.10MV能量时，全碳纤维主床体对剂量的衰减在1.4%~6.8%平均衰减4.1%；延长板对剂量的衰减在0.3%~3.6%平均衰减1.5%；延长板衔接处对剂量的衰减在3.0%~40.1%平均衰减7.6%.结论全碳纤维床板在体部治疗的后野时床板对剂量衰减有影响，应做出修正与补偿；因延长板剂量衰减小，头部治疗时应选用延长板治疗，并考虑射野不能包含延长板衔接处，特别是110°-130°或230°-250°机架时，因衔接处有金属卡扣，剂量衰减达40.15~43.1%.相同床板6MV X射线剂量衰减率大于10MV X射线，相同能量下，剂量衰减率随床板厚度增加而增加.
目的探討醫科達Synergy型醫用直線加速器全碳纖維治療床對放療劑量的影響.方法將標準固體水模置于治療床上，使固體水模中軸與治療床中心縱軸重閤.改變加速器機架角度，從不同角度照射併用劑量儀進行比對測量，計算齣全碳纖維治療床及其延長闆對放療劑量的衰減因子.結果6MV能量時，全碳纖維主床體對劑量的衰減在1.9%~7.2%平均衰減5.0%；延長闆對劑量的衰減在0.5%~4.4%平均衰減2.2%；延長闆銜接處對劑量的衰減在3.9%~43.1%平均衰減9.0%.10MV能量時，全碳纖維主床體對劑量的衰減在1.4%~6.8%平均衰減4.1%；延長闆對劑量的衰減在0.3%~3.6%平均衰減1.5%；延長闆銜接處對劑量的衰減在3.0%~40.1%平均衰減7.6%.結論全碳纖維床闆在體部治療的後野時床闆對劑量衰減有影響，應做齣脩正與補償；因延長闆劑量衰減小，頭部治療時應選用延長闆治療，併攷慮射野不能包含延長闆銜接處，特彆是110°-130°或230°-250°機架時，因銜接處有金屬卡釦，劑量衰減達40.15~43.1%.相同床闆6MV X射線劑量衰減率大于10MV X射線，相同能量下，劑量衰減率隨床闆厚度增加而增加.
목적탐토의과체Synergy형의용직선가속기전탄섬유치료상대방료제량적영향.방법장표준고체수모치우치료상상，사고체수모중축여치료상중심종축중합.개변가속기궤가각도，종불동각도조사병용제량의진행비대측량，계산출전탄섬유치료상급기연장판대방료제량적쇠감인자.결과6MV능량시，전탄섬유주상체대제량적쇠감재1.9%~7.2%평균쇠감5.0%；연장판대제량적쇠감재0.5%~4.4%평균쇠감2.2%；연장판함접처대제량적쇠감재3.9%~43.1%평균쇠감9.0%.10MV능량시，전탄섬유주상체대제량적쇠감재1.4%~6.8%평균쇠감4.1%；연장판대제량적쇠감재0.3%~3.6%평균쇠감1.5%；연장판함접처대제량적쇠감재3.0%~40.1%평균쇠감7.6%.결론전탄섬유상판재체부치료적후야시상판대제량쇠감유영향，응주출수정여보상；인연장판제량쇠감소，두부치료시응선용연장판치료，병고필사야불능포함연장판함접처，특별시110°-130°혹230°-250°궤가시，인함접처유금속잡구，제량쇠감체40.15~43.1%.상동상판6MV X사선제량쇠감솔대우10MV X사선，상동능량하，제량쇠감솔수상판후도증가이증가.
Objective To investigate the effect of radiotherapy dosage caused by the ELEKTA synergy medical linear accelerator all-carbon fiber treatment couch.Methods The solid water phantom was fixed at the axis center of couch. changed the angle of the machine gantry and compare with the dosimeter measurements to calculate the all-carbon fiber treatment couch and its extension plate to the radiation dose attenuation factor. Results At 6MV X-ray, the radiotherapy dose was declined by 1.9%~7.2%,0.5%~4.4% and 3.9%~43.1% average 5.0%,2.2% and 9.0%, when the main body of the all-carbon fiber treatment couch, the head extending couch plank and department of convergence between the them were used respectively; At 10MV X-ray, the radiotherapy dose was declined by 1.4%~6.8%,0.3%~3.6% and 3.0%~40.1%average 4.1%,1.5% and 7.6%,when the main body of the all-carbon fiber treatment couch, the head extending couch plank and department of convergence between the them were used respectively; Conclusions The back-flank field impact on the dose attenuation when the all-carbon fiber treatment couch is used,and shoule be rectified and revised by dose compensate. the head extending couch plank muse be chose in the head tumor radiotherapy.in the back-lank field about 110°-130 °or 230°-250°can not contain department of convergence in extending couch with metal buckle.it woule reduce the dose by 40.15~43.1%.The penetration factor of 6MV X-ray is smaller than that of 10 MV X-ray at the same angle. The penetration factors are reducing when the thickness of the couch plank increasing,under the same enger of irradiating X-ray.
