surface dose measurements and comparison of unflattened and flattened photon beams

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ID: 160009
2016
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Abstract
The purpose of this study was to evaluate the central axis dose in the build-up region and the surface dose of a 6 MV and 10 MV flattened photon beam (FB) and flattening filter free (FFF) therapeutic photon beam for different square field sizes (FSs) for a Varian Truebeam linear accelerator using parallel-plate ionization chamber and Gafchromic film. Knowledge of dosimetric characteristics in the build-up region and surface dose of the FFF is essential for clinical care. The dose measurements were also obtained empirically using two different commonly used dosimeters: a p-type photon semiconductor dosimeter and a cylindrical ionization chamber. Surface dose increased linearly with FS for both FB and FFF photon beams. The surface dose values of FFF were higher than the FB FSs. The measured surface dose clearly increases with increasing FS. The FFF beams have a modestly higher surface dose in the build-up region than the FB. The dependence of source to skin distance (SSD) is less significant in FFF beams when compared to the flattened beams at extended SSDs.
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sigamani2016journalsurface Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Ashokkumar Sigamani;Arunai Nambiraj;Girigesh Yadav;Ananda Giribabu;Karthikeyan Srinivasan;Venkadamanickam Gurusamy;Kothanda Raman;Kaviarasu Karunakaran;Rajesh Thiyagarajan
Journal arya atherosclerosis
Year 2016
DOI
10.4103/0971-6203.181648
URL
http://www.jmp.org.in/article.asp?issn=0971-6203;year=2016;volume=41;issue=2;spage=85;epage=91;aulast=Sigamani
Keywords
nuclear medicine medical radiology flattening filter-free; gafchromic films; nacp chamber; photon beams; surface dosemedical physics

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