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Dose corrections for field obliquity for 45‐MV x‐ray therapy
Author(s) -
McGinley Patton H.,
Clanton Anna,
Downes Beverly,
Nuskind Jeffrey
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 - 10.1118/1.595380
Subject(s) - field (mathematics) , nuclear medicine , physics , dosimetry , medical imaging , medical physics , medicine , mathematics , radiology , pure mathematics
The degree of dose perturbation produced by a 25.7‐cm‐diam circular water phantom was determined for a 45‐MV x‐ray beam by direct measurement. Data obtained in a circular and a cubical water phantom was utilized to test three accepted techniques (isodose shift, TAR method, and effective SSD method) for the correction of isodose levels to account for patient curvature. In general, the effective SSD method yielded the most accurate results for all depth including the buildup region. An isodose shift factor of 0.8 was found for the 45‐MV x‐ray beam.