Monte Carlo dose calculations for a 6-MV photon beam in a thorax phantom View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2006-05

AUTHORS

Alireza Farajollahi, Asghar Mesbahi

ABSTRACT

PURPOSE: In this study we evaluated the accuracy of the Monte Carlo (MC) and effective path length (EPL) methods for dose calculations in the inhomogeneous thorax phantom. MATERIALS AND METHODS: The Philips SL 75/5 linear accelerator head was modeled using the MCNP4C Monte Carlo code. An anatomic inhomogeneous thorax phantom was irradiated with a 6-MV photon beam, and the doses along points of the central axis of the beam were measured by a small ionization chamber. The central axis relative dose was calculated by the MCNP4C code and the EPL method in a conventional treatment planning system. The results of calculations and measurements were compared. RESULTS: For all measured points on the thorax phantom the results of the MC method were in agreement with the actual measurement (local difference was less than 2%). For the EPL method, the amount of error was dependent on the field size and the point location in the phantom. The maximum error was +19.5 and +26.8 for field sizes of 10 x 10 and 5 x 5 cm2 for lateral irradiation. CONCLUSION: Our study showed large, unacceptable errors for EPL calculations in the lung for both field sizes. The accuracy of the MC method was better than the recommended value of 3%. Thus, application of this method is strongly recommended for lung dose calculations, especially for small field sizes. More... »

PAGES

269-276

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s11604-005-1493-5

DOI

http://dx.doi.org/10.1007/s11604-005-1493-5

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1036527232

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/16958400


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