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Verification of lung dose in an anthropomorphic phantom calculated by the collapsed cone convolution method

Verification of lung dose in an anthropomorphic phantom calculated by the collapsed cone... Verification of calculated lung dose in an anthropomorphic phantom isperformed using two dosimetry media. Dosimetry is complicated by factorssuch as variations in density at slice interfaces and appropriate position on CTscanning slice to accommodate these factors. Dose in lung for a 6MV and10MV anterior-posterior field was calculated with a collapsed coneconvolution method using an ADAC Pinnacle, 3D planning system. Up to 5%variations between doses calculated at the centre and near the edge of the2cm phantom slice positioned at the beam central axis were seen, due tothe composition of each phantom slice. Validation of dose was performedwith LiF thermoluminescent dosimeters (TLDs) and X-Omat V radiographicfilm. Both dosimetry media produced dose results which agreed closely withcalculated results nearest their physical positioning in the phantom. Thecollapsed cone convolution method accurately calculates dose withininhomogeneous lung regions at 6MV and 10MV x-ray energy. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physics in Medicine and Biology IOP Publishing

Verification of lung dose in an anthropomorphic phantom calculated by the collapsed cone convolution method

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Copyright
Copyright © IOP Publishing Ltd
ISSN
0031-9155
eISSN
1361-6560
DOI
10.1088/0031-9155/45/11/402
Publisher site
See Article on Publisher Site

Abstract

Verification of calculated lung dose in an anthropomorphic phantom isperformed using two dosimetry media. Dosimetry is complicated by factorssuch as variations in density at slice interfaces and appropriate position on CTscanning slice to accommodate these factors. Dose in lung for a 6MV and10MV anterior-posterior field was calculated with a collapsed coneconvolution method using an ADAC Pinnacle, 3D planning system. Up to 5%variations between doses calculated at the centre and near the edge of the2cm phantom slice positioned at the beam central axis were seen, due tothe composition of each phantom slice. Validation of dose was performedwith LiF thermoluminescent dosimeters (TLDs) and X-Omat V radiographicfilm. Both dosimetry media produced dose results which agreed closely withcalculated results nearest their physical positioning in the phantom. Thecollapsed cone convolution method accurately calculates dose withininhomogeneous lung regions at 6MV and 10MV x-ray energy.

Journal

Physics in Medicine and BiologyIOP Publishing

Published: Nov 1, 2000

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