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Investigation of stereotactic radiotherapy dose using dosimetry film and Monte Carlo simulations

Kairn, Tanya, Crowe, Scott, Kenny, John, & Trapp, Jamie (2011) Investigation of stereotactic radiotherapy dose using dosimetry film and Monte Carlo simulations. Radiation Measurements, 46(12), pp. 1985-1988.

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Abstract

This study uses dosimetry film measurements and Monte Carlo simulations to investigate the accuracy of type-a (pencil-beam) dose calculations for predicting the radiation doses delivered during stereotactic radiotherapy treatments of the brain. It is shown that when evaluating doses in a water phantom, the type-a algorithm provides dose predictions which are accurate to within clinically relevant criteria, gamma(3%,3mm), but these predictions are nonetheless subtly different from the results of evaluating doses from the same fields using radiochromic film and Monte Carlo simulations. An analysis of a clinical meningioma treatment suggests that when predicting stereotactic radiotherapy doses to the brain, the inaccuracies of the type-a algorithm can be exacerbated by inadequate evaluation of the effects of nearby bone or air, resulting in dose differences of up to 10% for individual fields. The results of this study indicate the possible advantage of using Monte Carlo calculations, as well as measurements with high-spatial resolution media, to verify type-a predictions of dose delivered in cranial treatments.

Impact and interest:

4 citations in Scopus
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2 citations in Web of Science®

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124 since deposited on 30 Jun 2011
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ID Code: 42244
Item Type: Journal Article
Keywords: computer simulation, dosimetry, pencil beam, radiochromic film, stereotactic radiosurgery, radiotherapy, Monte Carlo, BEAM, radiation therapy, treatment planning
DOI: 10.1016/j.radmeas.2011.06.024
ISSN: 1350-4487
Subjects: Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > OTHER PHYSICAL SCIENCES (029900)
Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > OTHER PHYSICAL SCIENCES (029900) > Medical Physics (029903)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Past > Schools > Physics
Copyright Owner: Copyright 2011 Elsevier
Copyright Statement: NOTICE: this is the author’s version of a work that was accepted for publication in Radiation Measurements. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Radiation Measurements, [VOL 46, ISSUE 12, (2011)] 10.1016/j.radmeas.2011.06.024
Deposited On: 30 Jun 2011 11:43
Last Modified: 14 Dec 2011 11:00

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