Dosimetric properties of a flattening filter-free 6-MV photon beam: a Monte Carlo study View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2007-08

AUTHORS

Asghar Mesbahi, Parinaz Mehnati, Ahmad Keshtkar, Alireza Farajollahi

ABSTRACT

PURPOSE: The dosimetric features of an unflattened 6-MV photon beam of an Elekta SL-25 linac was calculated by the Monte Carlo (MC) method. MATERIAL AND METHODS: The head of the Elekta SL-25 linac was simulated using the MCNP4C MC code. The accuracy of the model was evaluated using measured dosimetric features, including depth dose values and dose profiles in a water phantom. The flattening filter was then removed, and beam dosimetric properties were calculated by the MC method and compared with those of the flattened photon beam. RESULTS: Our results showed a significant (twofold) increase in the dose rate for all field sizes. Also, the photon beam spectra for an unflattened beam were softer, which led to a steeper reduction in depth doses. The decrease in the out-of-field dose and increase in the contamination electrons and a buildup region dose were the other consequences of removing the flattening filter. CONCLUSION: Our study revealed that, for recent radiotherapy techniques, the use of multileaf collimators for beam shaping removing the flattening filter could offer some advantages, including an increased dose rate and decreased out-of-field dose. More... »

PAGES

315-324

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s11604-007-0142-6

DOI

http://dx.doi.org/10.1007/s11604-007-0142-6

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1008784864

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/17705000


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