Scatter integration with right triangular fields.
Scatter integration with right triangular fields.
复制标题
与直角三角形场的散积分。
DOI：
10.1118/1.595710
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发表时间：
1985
期刊：
影响因子：
3.8
通讯作者：
Bjärngard,BE
中科院分区：
文献类型：
--
作者：
Siddon,RL;Dewyngaert,JK;Bjärngard,BE
等效场的概念广泛应用于放射治疗剂量计算算法中。使用等效场的基本原理是允许对各种场形状进行剂量计算，同时仅保留少数形状非常规则的场的剂量计算数据。一个常见的例子是 Day 在《英国放射学杂志》上提出的矩形视野的等效平方表。最近，在寻找不规则场的快速剂量计算算法时，我们引入了直角三角形场的等效平方的概念。结果表明，任意不规则的 N 个顶点域可以分解为 2N 个直角三角形域，每个直角三角形域都有一个预先计算的等效平方。然后，获得由不规则场引起的计算点处的散射，作为来自等效平方的散射贡献的总和。将直角三角形的散点积分与使用programirreg 的散点积分进行比较。
The concept of the equivalent field is used extensively in radiotherapy dose calculation algorithms. The rationale for using equivalent fields is to allow dose calculations for a wide variety of field shapes, while maintaining dose calculational data for only a few, very regularly shaped fields. A common example is the table of equivalent squares of rectangular fields presented by Day in theBritish Journal of Radiology. Recently, in searching for fast dose calculation algorithms for irregular fields, we introduced the concept of the equivalent square of a right triangular field. It is shown that an arbitrary irregular field ofNvertices may be decomposed into 2Nright triangular fields, each with a precalculated equivalent square. The scatter at the point of calculation due to the irregular field is then obtained as a sum of the scatter contributions from the equivalent squares. The scatter integration with right triangles is compared with scatter integration using programirreg.