三维放射计划治疗中病灶深度计算

Calculation of the Depth of Lesion in Three─Dimensional Treatment Planning

作者提出了一种放射计划治疗中病灶深度的计算方法，在三维物体的表示中，引进棱柱表示的概念，把射线与大脑的三维求交运算转化为二维中直线与轮廓多边形求交问题。该方法简便且计算量大为减少。

In this paper we present a method used to calculate the depth of lesion in treatment planning of stereotactic radiosurgery. By using prisma representation of 3─D object, complex threedimensional ray─brain intersection problem is reduced to two─dimensional line polygon contour intersection problem. The method is simple and the amount of calculation is reduced greatly.