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Comparison of moving‐strip therapy using a Cobalt‐60 teletherapy unit, a Varian 4‐MV linear accelerator, and a Varian 10‐MV linear accelerator
Author(s) -
Leavitt Dennis D.,
Stryker John A.,
Campbell Dale W.,
Strockbine Melvin F.,
Wright Ann
Publication year - 1977
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 - 10.1118/1.594369
Subject(s) - linear particle accelerator , dosimetry , nuclear medicine , cobalt 60 , radiation therapy , thermoluminescent dosimetry , monitor unit , percentage depth dose curve , thermoluminescent dosimeter , materials science , medical physics , physics , ionization chamber , medicine , optics , beam (structure) , radiology , dosimeter , irradiation , nuclear physics , ion , quantum mechanics , ionization
Cobalt‐60 γ rays and 4‐ and 10‐MV x rays are compared for moving‐strip therapy in terms of the dose uniformity and the given dose needed to deliver a prescribed tumor dose. Dose distributions in phantoms of 14–32‐cm thickness were calculated for each therapy unit. Individual given doses which would deliver the most uniform dose along the midline of the treatment volume were determined by computer and were verified experimentally by thermoluminescent dosimetry. Using computer optimization techniques, the midplane dose uniformity is improved significantly for the three therapy units considered.