摘要
本文提出沿着等剂量线倾斜方向,等距地在同深度测量三点剂量,根据这三点剂量推导出楔形角和线顺角的方法,计算公式为:式中α为射线入射角,K是三点剂量及射束轴上百分深度量的函数。文中比较了本法和三维水箱扫描法所得楔形角大小.二者十分一致。在楔形角测量中、作者发现钴-60γ线楔形角随深度有明显改变,故建议在使用楔形滤板前,应作必要的校测。
The doses at three points along the oblique direction of isodose line at the same depth aremeasured.The wedgeangle and the line-oblique angle are derived from these doses measured according to the following formula:The wedge angles calculated by above formula were compared with these measured by 3-D water-scanner phantom,It was found that the results were very closed,this confirmed the correctness of the for-mula.It is recommended that the wedge angles may be measured before its use,because the wedge anglesvaries greatly tissue with the depth.
出处
《癌症》
SCIE
CAS
CSCD
北大核心
1996年第2期139-140,共2页
Chinese Journal of Cancer