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An equivalent squares template.

I I Rosen·R G Lane·H L Van Camp
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Abstract

A template for calculating equivalent squares of irregularly shaped fields is described. Calculations using the template are essentially scatter summations. Comparisons with a computer program showed good agreement in equivalent squares and tumor doses (within 0.8%). Comparisons with area-perimeter ratio methods of computing equivalent squares showed consistently better accuracy using the template. For highly irregular fields, the template calculation required 3-10 min for central axis computation, comparable to that required by the other manual methods.

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I I Rosen, R G Lane, H L Van Camp. An equivalent squares template.. https://doi.org/10.1118/1.595353

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