A METHOD FOR THE ASSESSMENT OF THE OUTPUT OF IRREGULARLY SHAPED ELECTRON FIELDS

被引：10

作者：

JONES, D ^{[1
]}

ANDRE, P ^{[1
]}

WASHINGTON, JT ^{[1
]}

HAFERMANN, MD ^{[1
]}

机构：

[1] VIRGINIA MASON MED CTR,DEPT RADIAT ONCOL,SEATTLE,WA 98101

来源：

BRITISH JOURNAL OF RADIOLOGY | 1990年 / 63卷 / 745期

关键词：

D O I：

10.1259/0007-1285-63-745-59

中图分类号：

R8 [特种医学]; R445 [影像诊断学];

学科分类号：

1002 ; 100207 ; 1009 ;

摘要：

A simple approach to the calculation of dose in cone-collimated electron fields is presented. The method accounts for variations in lateral scatter with field size using a Clarkson Integration. The reduction in output by an irregularly shaped aperture is evaluated based on measurements of the output at various distances from the aperture in a field 2.5 cm in diameter. The first 14 months of clinical use were analysed and it is shown that in 42 out of 600 calculations, the cutout factor was less than 0.95 and that in 77% of these, the calculation method was accurate to ±3%.

引用

页码：59 / 64

页数：6

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