RADIATION FIELD MODELING

这基本上是正在进行的研究和开发。 的 计算吸收剂量分布的能力 由最重要的光子束和电子束产生 一般特征在放射治疗中至关重要。 从概念上讲，该辐射场模型以 经验分布沿着三个相互垂直 在"主字段"中引用行。"数学表达式 描述视野大小、深度和焦点变化的影响 距离 这一概念被应用于光束修正装置 也 这种方法从理论上讲是有吸引力的， 一个实际的观点。 目前的调查包括 的影响的处理的一般化 不均匀性 新概念在描述的沿着- 的射线分布以及场大小的依赖性 已制定并正在实施射束轮廓。 一 一种全新的电子场建模方法， 正在进行中，非常有希望。 特别值得注意的是 大量的电子能量和 需要灵活应用不同的能量和场 形状与光子场的组合。 对于高能量 光子

This is fundamentally ongoing research and development. The capability to calculate the distribution of absorbed dose produced by photon beams and electron beams of the most general characteristics is of vital importance in radiotherapy. Conceptually, this radiation field model takes as a basis the empirical distributions along three mutually perpendicular reference lines in a "master field." Mathematical expressions describe the effect of variations of field size, depth and focal distance. This concept is applied to the beam-modifying devices as well. The approach is attractive from a theoretical as well as a practical point of view. The present investigations include the generalization of the treatment of the influence of inhomogeneities. New concepts in the description of the along- the-ray distribution as well as the field size dependence of the beam profile have been developed and are being implemented. A completely new approach to electron field modeling is well underway and extremely promising. Of special interest are the implications of the large number of electron energies and the need for flexible application of different energies and field shapes in combination with photon fields. For the high energy photon