EXPERIMENTAL VALIDATION OF MONTE-CARLO DOSE CALCULATIONS ABOUT A HIGH-INTENSITY IR-192 SOURCE FOR PULSED DOSE-RATE BRACHYTHERAPY

被引：70

作者：

VALICENTI, RK

KIROV, AS

MEIGOONI, AS

MISHRA, V

DAS, RK

WILLIAMSON, JF

机构：

[1] Radiation Oncology Center, Mallinckrodt Institute of Radiology, Washington University School of Medicine, St. Louis, Missouri

来源：

MEDICAL PHYSICS | 1995年 / 22卷 / 06期

关键词：

IR-192; PULSED DOSE RATE; THERMOLUMINESCENT DOSIMETRY; MONTE CARLO;

D O I：

10.1118/1.597484

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：

Despite widespread use of high-intensity lr-192 remotely afterloaded sources, no published measured or calculated dose-rate tables for currently used source designs are available. For a pulsed dose-rate lr-192 source, both transverse axis (0.5-10 cm) and two-dimensional polar dose-rate profiles (1.5, 3, and 5 cm) were measured with thermoluminescent dosimetry in a solid water phantom. Dose rates were normalized to measured air-kerma strength, and the source geometry was verified by pinhole autoradiography and transmission radiography. At each measurement point, dose rates were calculated by a Monte Carlo photon transport (MCPT) code, which realistically modeled the experimental phantom, source, and detector geometry. Agreement between MCPT absolute dose-rate calculations and measurements averaged 3% and was less than 5%, demonstrating that Monte Carlo simulation is an accurate and powerful tool for two-dimensional dosimetric characterization of high activity lr-192 sources. © 1995, American Association of Physicists in Medicine. All rights reserved.

引用

页码：821 / 829

页数：9