MEASUREMENT OF THE SOURCE SIZE OF A 6-MV AND 18-MV RADIOTHERAPY LINAC

被引：31
|
作者：
LOEWENTHAL, E
LOEWINGER, E
BARAVRAHAM, E
BARNEA, G
机构：
来源：
MEDICAL PHYSICS | 1992年 / 19卷 / 03期
关键词：
D O I：
10.1118/1.596812
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：
The quality of portal imaging is strongly affected by the source size of the radiotherapy machine. The effective source size of the dual-energy clinac 1800 (6 and 18 MV) was measured with a 50-mu-m wide and 120 mm long slit formed by two tungsten-copper alloy blocks. A series of slit images were obtained by translating the slit horizontally. The images were analyzed using a microdensitometer. The measured data was simulated using an analytical model of the source and its size was derived by a best-fit analysis. For both energies the FWHM was found to be 1.5+/-0.1 mm.
引用
收藏
页码：687 / 690
页数：4
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