On absorbed dose in narrow 60Co gamma-ray beams and dosimetry of the Gamma Knife

被引：18
|
作者：
Nizin, PS
机构：
[1] Baylor Coll Med, Dept Radiol, Houston, TX 77030 USA
[2] Methodist Hosp, Dept Radiat Therapy, Houston, TX 77030 USA
来源：
MEDICAL PHYSICS | 1998年 / 25卷 / 12期
关键词：
Co-60 gamma rays; narrow beams; electronic disequilibrium; absorbed dose; Gamma Knife;
D O I：
10.1118/1.598444
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：
Using separate analytical functions describing primary dose, P-0(d(m),r), collimator scatter, S-c(r), and phantom scatter, TAR(d,r), an expression for absorbed dose in narrow Co-60 gamma-ray beams is developed and each function is quantified: D(d, r)= P-0(d(m),r) S-c(r) TAR(d, r). The absorbed dose is calculated in beams as narrow as 0.2 cm in radius. Analytical and experimental results are compared using measured dose data for the Gamma Knife. Close agreement with experimental data is observed. (C) 1998 American Association of Physicists in Medicine. [S0094-2405(98)02612-1].
引用
收藏
页码：2347 / 2351
页数：5
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