Monte Carlo study on a flattening filter-free 18-MV photon beam of a medical linear accelerator View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2008-07

AUTHORS

Asghar Mesbahi, Farshad Seyed Nejad

ABSTRACT

PURPOSE: Several studies on the dosimetric properties of unflattened photon beams have shown some advantages for radiotherapy. In this study, the effect of removing the flattening filter from an 18-MV photon beam was investigated using the Monte Carlo method. MATERIALS AND METHODS: The 18-MV photon beam of an Elekta SL25 linear accelerator was simulated using the MCNP4C Monte Carlo (MC) code. Beam dosimetric features, including central axis absorbed doses, beam profiles, and photon energy spectra, were calculated for flattened and unflattened 18-MV photon beams. RESULTS: A 4.24-fold increase in the dose rate was seen for the unflattened beam with a field size of 10 x 10 cm(2). A decrease in the out-of-field dose up to 30% was seen for the unflattened beam. For the unflattened beam, photon energy spectra were softer, and the mean energies of the spectra were higher for a smaller field size. CONCLUSION: Our study showed that the increase in dose rate and lower out-of-field dose can be possible advantages for an unflattened 18-MV beam. More... »

PAGES

331-336

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s11604-008-0234-y

DOI

http://dx.doi.org/10.1007/s11604-008-0234-y

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1052131987

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/18677606


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