三维适形放疗计划系统中的交互式测量方法

为了在制定三维适形放疗计划时合理地确定射线角度，并根据给定射线方向准确计算射线剂量，需要对三维模型进行精确的交互式测量。结合放疗计划系统的需求和医学图像特点，分析三维交互式测量过程，应用平行投影理论实现二维坐标到三维坐标的转换。提出以一个测量端点为起始点的三维任意叠加旋转算法，在重离子放疗计划系统中实现三维精确测量。实验结果证明了该方法的可行性和有效性。

Interactive Measurement Method in 3-D Conformal Radiotherapy Planning System

For obtaining appropriate angle of radiation and calculating accurate dose of radiation according to the given orientation of radiation while making 3-D conformal radiotherapy plan, it is necessary to do interactive measurement of 3-D model accurately. Integrating the requirement of radiotherapy planning system and the characteristic of medical image, this paper analyzes the process of 3-D interactive measurement, applies parallel projection theory to realize the coordinate transformation from 2-D to 3-D, and proposes 3-D arbitrary superimposed rotation algorithm which uses one measurement extreme point as origin. 3-D precise measurement is realized in heavy ion radiotherapy planning system. Experimental results prove that the method is feasible and effective.