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Monte Carlo simulation of portal dosimetry on a rectilinear voxel geometry: a variable gantry angle solution

Chin, P. W., Spezi, Emiliano and Lewis, D. G. 2003. Monte Carlo simulation of portal dosimetry on a rectilinear voxel geometry: a variable gantry angle solution. Physics in Medicine and Biology 48 (16) , N231-N238. 10.1088/0031-9155/48/16/401

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Abstract

A software solution has been developed to carry out Monte Carlo simulations of portal dosimetry using the BEAMnrc/DOSXYZnrc code at oblique gantry angles. The solution is based on an integrated phantom, whereby the effect of incident beam obliquity was included using geometric transformations. Geometric transformations are accurate within ±1 mm and ±1° with respect to exact values calculated using trigonometry. An application in portal image prediction of an inhomogeneous phantom demonstrated good agreement with measured data, where the root-mean-square of the difference was under 2% within the field. Thus, we achieved a dose model framework capable of handling arbitrary gantry angles, voxel-by-voxel phantom description and realistic particle transport throughout the geometry.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: Q Science > QC Physics
Q Science > QH Natural history > QH301 Biology
R Medicine > R Medicine (General)
T Technology > TA Engineering (General). Civil engineering (General)
Publisher: Institute of Physics
ISSN: 0031-9155
Last Modified: 04 Jun 2017 08:05
URI: http://orca-mwe.cf.ac.uk/id/eprint/72590

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