Monte Carlo model of the scanning beam digital x-ray (SBDX) source

被引:6
作者
Bazalova, M. [1 ]
Weil, M. D. [2 ]
Wilfley, B. [3 ]
Graves, E. E. [1 ]
机构
[1] Stanford Univ, Dept Radiat Oncol, Stanford, CA 94305 USA
[2] Sirius Med LLC, Half Moon Bay, CA 94019 USA
[3] Triple Ring Technol, Newark, CA 94560 USA
关键词
SKIN INJURIES; RADIATION; TOMOSYNTHESIS; SIMULATIONS; EFFICIENCY; EXPOSURE;
D O I
10.1088/0031-9155/57/22/7381
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
The scanning-beam digital x-ray (SBDX) system has been developed for fluoroscopic imaging using an inverse x-ray imaging geometry. The SBDX system consists of a large-area x-ray source with a multihole collimator and a small detector. The goal of this study was to build a Monte Carlo (MC) model of the SBDX source as a useful tool for optimization of the SBDX imaging system in terms of its hardware components and imaging parameters. The MC model of the source was built in the EGSnrc/BEAMnrc code and validated using the DOSXYZnrc code and Gafchromic film measurements for 80, 100, and 120 kV x-ray source voltages. The MC simulated depth dose curves agreed with measurements to within 5%, and beam profiles at three selected depths generally agreed within 5%. Exposure rates and half-value layers for three voltages were also calculated from the MC simulations. Patient skin-dose per unit detector-dose was quantified as a function of patient size for all three x-ray source voltages. The skin-dose to detector-dose ratio ranged from 5-10 for a 20 cm thick patient to 1 x 10(3)-1 x 10(5) for a 50 cm patient for the 120 and 80 kV beams, respectively. Simulations of imaging dose for a prostate patient using common imaging parameters revealed that skin-dose per frame was as low as 0.2 mGy.
引用
收藏
页码:7381 / 7394
页数:14
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