电子限光筒对瓦里安20电子线射野内外吸收剂量的影响。

Effects of electron cutouts on absorbed dose in and outside Varian-20 electron fields.

作者信息

Kubo H

机构信息

Albany Medical College, Department of Radiation Oncology, NY 12058.

出版信息

Med Dosim. 1990 Jun;15(2):61-6. doi: 10.1016/0958-3947(90)90035-g.

DOI:10.1016/0958-3947(90)90035-g

PMID:2118360

Abstract

Electron beam outputs in the presence of beam shaping cutouts were measured for 6, 9, 12, 16, and 20 MeV electrons from a Varian-20 linear accelerator. This machine was provided with a new model of electron cones, for which photon jaw sizes were set differently from those of old cones. The effects of different photon jaw sizes on the electron outputs were studied. Also measured was the absorbed dose under a cutout, which was presumably contributed by scattered electrons and bremsstrahlung photons.

摘要

对Varian - 20直线加速器产生的6、9、12、16和20兆电子伏电子，测量了存在射野整形挡块时的电子束输出。这台机器配备了新型电子限光筒，其光子准直器尺寸设置与旧型限光筒不同。研究了不同光子准直器尺寸对电子输出的影响。还测量了挡块下的吸收剂量，其可能由散射电子和轫致辐射光子所致。