准直器设计对高能电子束等剂量曲线形状的影响。

Influence of collimator design on the shape of isodose curves in high energy electron beams.

作者信息

Hammoudah M M

出版信息

J Med. 1979;10(6):467-78.

Abstract

Families of isodose curves for electron beams of 20 and 34 MeV were obtained for two different kinds of collimator designs. The lucite localizer of the original collimator of the betatron was replaced by a modified metal device. Electron isodose distributions were obtained for circular, and rectangular field sizes employing film dosimetry. The results show that an improvement was achieved in the symmetry of the beam and in the reduction of the penumbral region when the original lucite localizers were replaced by brass defining plates at the patient's skin. The new proposed electron-localizers are described in this study and their influence on depth dose distributions is discussed.

摘要

针对两种不同的准直器设计，获得了20 MeV和34 MeV电子束的等剂量曲线族。电子感应加速器原始准直器的有机玻璃定位器被一种改进的金属装置所取代。采用胶片剂量测定法，获得了圆形和矩形射野尺寸的电子等剂量分布。结果表明，当用黄铜定位板取代患者皮肤处的原始有机玻璃定位器时，射束对称性得到改善，半影区缩小。本研究描述了新提出的电子定位器，并讨论了它们对深度剂量分布的影响。