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. 2014 Summer;39(2):127-8.
doi: 10.1016/j.meddos.2013.09.005. Epub 2014 Feb 14.

A simple formula to determine the bolus thickness on an oblique surface

Matthew Vossler  1
Affiliations

A simple formula to determine the bolus thickness on an oblique surface

Matthew Vossler. Med Dosim. 2014 Summer.

Abstract

For certain clinical situations such as breast treatments, a bolus is used and must be accounted for in monitor unit calculations. Because of the oblique incidence involved, the thickness of bolus traversed by the radiation beam, as opposed to its nominal thickness, must be used. Using principles of geometry, a simple method is derived to calculate the thickness of bolus for these calculations.

Keywords: Bolus; Monitor unit calculations; Oblique incidence.

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