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Dosimetry of effective wedge fields produced by an internal wedge
Author(s) -
Boyer Arthur L.,
Tung Samuel,
Otte Victor,
Wells Nathan,
Steadham Roy
Publication year - 1994
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 - 10.1118/1.597257
Subject(s) - wedge (geometry) , dosimetry , monitor unit , field size , physics , optics , nuclear medicine , medicine
A procedure is described to calculate the monitor unit ratios required to produce effective wedge fields having a desired wedge angle by combining an internal 60° wedge with an open field. Complementary procedures are derived and demonstrated for calculating the effective wedge dose distributions with wedge angles of 15°, 30°, and 45° using the central axis depth dose data and off‐axis ratios of the open field and the 60° wedged field. Measurements at five points on and off the central axis within each field and measurements of the effective wedge factor demonstrated that the calculated wedge distributions were correctly delivered to within 2% in all cases.