A METHOD OF CALCULATING PERIPHERAL DOSE DISTRIBUTIONS OF PHOTON BEAMS BELOW 10-MV

被引:29
作者
MCPARLAND, BJ [1 ]
FAIR, HI [1 ]
机构
[1] UNIV TORONTO,DEPT MED BIOPHYS,TORONTO M4X 1K9,ONTARIO,CANADA
关键词
RADIATION DOSIMETRY; PERIPHERAL DOSE; SCATTER DOSE;
D O I
10.1118/1.596858
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 radiation dose outside the radiotherapy treatment field can be of clinical concern and, therefore, a method of accurately predicting the peripheral doses received by tissues would be beneficial. This paper describes a semiempirical method developed for calculating the peripheral dose received at points outside the collimated field edge for incident photon beams with energies below neutron production thresholds (< 10 MV). The dependence of the peripheral dose upon depth, distance, field shape and size, azimuthal angle about the central axis, external contour variations, and tissue heterogeneities are accounted for by this calculation. Predictions by this algorithm are compared with measurements and it is shown that the method is capable of reproducing the measured peripheral dose values usually to within the statistical uncertainties of the data.
引用
收藏
页码:283 / 293
页数:11
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