中华放射肿瘤学杂志
中華放射腫瘤學雜誌
중화방사종류학잡지
CHINESE JOURNAL OF RADIATION ONCOLOGY
2008年
2期
120-122
,共3页
徐志勇%李龙根%周莉钧%邱健健%常熙%胡伟刚%陈俊超%章真%蒋国梁
徐誌勇%李龍根%週莉鈞%邱健健%常熙%鬍偉剛%陳俊超%章真%蔣國樑
서지용%리룡근%주리균%구건건%상희%호위강%진준초%장진%장국량
剂量引导放疗%质量保证%锥形束CT
劑量引導放療%質量保證%錐形束CT
제량인도방료%질량보증%추형속CT
Dose-guided radiotherapy%Quality assurance%Cone-beam CT
目的 了解西门子带兆伏级锥形束CT直线加速器用低跳数(MU)方式旋转成像时的输出剂量以确保治疗质量.方法 测量加速器照射7 MU下的输出剂量5次,开机6 h后再测量7MU下输出剂量5次,了解输出剂量稳定性.结果 5～20 MU之间,输出剂量呈线性.7 MU前5次输出剂量为(5.74±0.01)cGy,开机6 h后的输出剂量为(5.76±0.01)cGy.两个均值间的差异为0.41%,说明MV-CBCT低剂量旋转成像照射的出束剂量是稳定的.结论 兆伏级锥形束CT成像的剂量特性符合临床使用要求.
目的 瞭解西門子帶兆伏級錐形束CT直線加速器用低跳數(MU)方式鏇轉成像時的輸齣劑量以確保治療質量.方法 測量加速器照射7 MU下的輸齣劑量5次,開機6 h後再測量7MU下輸齣劑量5次,瞭解輸齣劑量穩定性.結果 5～20 MU之間,輸齣劑量呈線性.7 MU前5次輸齣劑量為(5.74±0.01)cGy,開機6 h後的輸齣劑量為(5.76±0.01)cGy.兩箇均值間的差異為0.41%,說明MV-CBCT低劑量鏇轉成像照射的齣束劑量是穩定的.結論 兆伏級錐形束CT成像的劑量特性符閤臨床使用要求.
목적 료해서문자대조복급추형속CT직선가속기용저도수(MU)방식선전성상시적수출제량이학보치료질량.방법 측량가속기조사7 MU하적수출제량5차,개궤6 h후재측량7MU하수출제량5차,료해수출제량은정성.결과 5～20 MU지간,수출제량정선성.7 MU전5차수출제량위(5.74±0.01)cGy,개궤6 h후적수출제량위(5.76±0.01)cGy.량개균치간적차이위0.41%,설명MV-CBCT저제량선전성상조사적출속제량시은정적.결론 조복급추형속CT성상적제량특성부합림상사용요구.
Objective To investigate dose characteristics of megavoltage cone-beam CT in the low MU and rotation way for imaging,and to improve the quality assuraflce. Methods Dose linearity,a parameter describing beam characteristics,was measured for different numbers of MUs on megavoltage conebeam CT accelerator.Dose stability was measured 5 times using exposure of 7 MUs,which was repeated another 5 times 6 hours after. Results Dose linearity was good using exposure between 5 and 20 MUs.The average dose among the first and second 5 measurements was(5.74±0.01)Gy and(5.76±0.01)Gy while exposure of the accelerator was 7 MU.The difference between the two doses was 0.41%. he dose was stability while megavoltage cone-beam CT image was in the low MU and rotation way. Conclusion Dose characteristics of megavoltage cone-beam CT in the low MU and rotation way for imaging can qualify clinically application.
