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

By Tanya Kairn, Scott Crowe, John Kenny and Jamie Trapp

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

Topics: 029900 OTHER PHYSICAL SCIENCES, 029903 Medical Physics, computer simulation, dosimetry, pencil beam, radiochromic film, stereotactic radiosurgery, radiotherapy, Monte Carlo, BEAM, radiation therapy, treatment planning
Publisher: Elsevier BV
Year: 2011
DOI identifier: 10.1016/j.radmeas.2011.06.024
OAI identifier: oai:eprints.qut.edu.au:42244

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