Gutt V F, Kuphal K, Hodapp N
Radiologische Klinik, Universitätsklinikum Freiburg.
Strahlenther Onkol. 1990 Sep;166(9):603-9.
Very small electron beams show considerable reduction of the dose output factor, the therapeutically relevant range, the practical range and the therapeutically relevant field size, compared to broad beams. The first three effects were measured on the central beam axis for different quadratic field sizes and are presented in the first part of this publication. A simple field zone method for calculation of irregular shaped electron beams was developed from the different depth dose curves. The method allows the determination of the maximum dose and the 80% range with sufficient accuracy for practical purposes. The examination of the reduction of the therapeutically relevant field size and the consequences following thereof with respect to the adequate electron therapy of a small irregular target volume will be published in a second part.
与宽束电子束相比，极细电子束的剂量输出因子、治疗相关范围、实际射程和治疗相关射野尺寸显著减小。前三种效应是在不同方形射野尺寸的中心射束轴上测量的，并在本出版物的第一部分中给出。根据不同的深度剂量曲线，开发了一种用于计算不规则形状电子束的简单射野分区方法。该方法能够以足够的精度确定最大剂量和80%射程，以满足实际应用需求。关于治疗相关射野尺寸减小及其对小的不规则靶区进行适当电子治疗的影响，将在第二部分发表。
