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Original Article

Korean Journal of Medical Physics 2014; 25(4): 225-232

Published online December 30, 2014

Copyright © Korean Society of Medical Physics.

Characteristics of Photon Beam through a Handmade Build-Up Modifier as a Substitute of a Bolus

Sung Joon Kim*, Seoung Jun Lee*, Su Ho Moon*, Ki Ho Seol, Jeong Eun Lee

Department of Radiation Oncology, *Kyungpook National University Hospital, Kyungpook National University School of Medicine, Daegu, Korea

Received: November 28, 2014; Revised: December 16, 2014; Accepted: December 20, 2014

Abstract

We evaluated the effect of scatter on a build-up region based on the measured percent depth dose (PDD) of high-energy photon beams that penetrated a handmade build-up modifier (BM) as a substitute of bolus. BM scatter factors (SBM) were calculated based on the PDDs of photon beams that penetrated through the BM. The calculated SBM values were normalized to 1 at the square field side (SFS) of 30 mm without a BM. For the largest SFS (200 mm), the SBM values for a 6-MV beam were 1.331, 1.519, 1.598, 1.641, and 1.657 for the corresponding BM thickness values. For a 10-MV beam, the SBM values were 1.384, 1.662, 1.825, 1.913, and 2.001 for the corresponding BM thickness values. The BM yielded 76% of the bolus efficiency. We expect BM to become useful devices for deep-set patient body parts to which it is difficult to apply a bolus.

KeywordsBuild-up modifier (BM), BM scatter factor (SBM), Percent depth dose (PDD), Surface dose

Korean Society of Medical Physics

Vol.35 No.2
June 2024

pISSN 2508-4445
eISSN 2508-4453
Formerly ISSN 1226-5829

Frequency: Quarterly

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