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Intensity modulated irradiation of a thorax phantom: comparisons between measurements, Monte Carlo calculations and pencil beam calculations

Intensity modulated irradiation of a thorax phantom: comparisons between measurements, Monte... The present study investigates the application of compensators forthe intensity modulated irradiation of a thorax phantom. Measurements arecompared with Monte Carlo and standard pencil beam algorithm dosecalculations. Compensators were manufactured to produce the intensity profilesthat were generated from the scientific version of the KonRad IMRTtreatment-planning system for a given treatment plan. The comparison of dosedistributions calculated with a pencil beam algorithm, with the Monte Carlocode EGS4 and with measurements is presented. By measurements in a waterphantom it is demonstrated that the method used to manufacture thecompensators reproduces the intensity profiles in a suitable manner.Monte Carlo simulations in a water phantom show that theaccelerator head model used for simulations is sufficient. No significantoverestimations of dose values inside the target volume by the pencil beamalgorithm are found in the thorax phantom. An overestimation of dose values inlung by the pencil beam algorithm is also not found. Expected dose calculationerrors of the pencil beam algorithm are suppressed, because the dose to thelow density region lung is reduced by the use of a non-coplanar beamarrangement and by intensity modulation. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physics in Medicine and Biology IOP Publishing

Intensity modulated irradiation of a thorax phantom: comparisons between measurements, Monte Carlo calculations and pencil beam calculations

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Copyright
Copyright © IOP Publishing Ltd
ISSN
0031-9155
eISSN
1361-6560
DOI
10.1088/0031-9155/46/6/308
Publisher site
See Article on Publisher Site

Abstract

The present study investigates the application of compensators forthe intensity modulated irradiation of a thorax phantom. Measurements arecompared with Monte Carlo and standard pencil beam algorithm dosecalculations. Compensators were manufactured to produce the intensity profilesthat were generated from the scientific version of the KonRad IMRTtreatment-planning system for a given treatment plan. The comparison of dosedistributions calculated with a pencil beam algorithm, with the Monte Carlocode EGS4 and with measurements is presented. By measurements in a waterphantom it is demonstrated that the method used to manufacture thecompensators reproduces the intensity profiles in a suitable manner.Monte Carlo simulations in a water phantom show that theaccelerator head model used for simulations is sufficient. No significantoverestimations of dose values inside the target volume by the pencil beamalgorithm are found in the thorax phantom. An overestimation of dose values inlung by the pencil beam algorithm is also not found. Expected dose calculationerrors of the pencil beam algorithm are suppressed, because the dose to thelow density region lung is reduced by the use of a non-coplanar beamarrangement and by intensity modulation.

Journal

Physics in Medicine and BiologyIOP Publishing

Published: Jun 1, 2001

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