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An equivalent squares template
Author(s) -
Rosen Isaac I.,
Lane Richard G.,
Van Camp Harlan L.
Publication year - 1983
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.595353
Subject(s) - computation , least squares function approximation , algorithm , perimeter , mathematics , computer science , geometry , statistics , estimator
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.