ACTIVITY DISTRIBUTION OF A CO-60 TELETHERAPY SOURCE

被引：5

作者：

JAFFRAY, DA ^{[4
]}

MUNRO, P

BATTISTA, JJ

FENSTER, A

机构：

[1] LONDON REG CANC CTR,LONDON N6A 4L6,ONTARIO,CANADA

[2] ROBARTS RES INST,IMAGING RES LABS,LONDON N6A 5K8,ONTARIO,CANADA

[3] UNIV WESTERN ONTARIO,DEPT RADIOL,LONDON N6A 3K7,ONTARIO,CANADA

[4] UNIV WESTERN ONTARIO,DEPT MED BIOPHYS,LONDON N6A 3K7,ONTARIO,CANADA

来源：

MEDICAL PHYSICS | 1991年 / 18卷 / 02期

关键词：

CO-60; STRIP INTEGRAL; PORTAL IMAGING; SPATIAL RESOLUTION;

D O I：

10.1118/1.596672

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：

In the course of quantifying the effect of radiation source size on the spatial resolution of portal images, a concentric ring structure in the activity distribution of a Cobalt-60 teletherapy source has been observed. The activity distribution was measured using a strip integral technique and confirmed independently by a contact radiograph of an identical but inactive source replica. These two techniques suggested that this concentric ring structure is due to the packing configuration of the small Co-60 pellets that constitute the source. The source modulation transfer function (MTF) showed that this ring structure has a negligible influence on the spatial resolution of therapy images when compared to the effect of the large size of the Co-60 source.

引用

页码：288 / 291

页数：4