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Evaluation of a commercial three‐dimensional electron pencil beam algorithm
Author(s) -
MullerRunkel Renate,
Cho SangHyun
Publication year - 1997
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 - 10.1118/1.597915
Subject(s) - electron , pencil (optics) , cathode ray , physics , slab , beam (structure) , optics , thermoluminescent dosimeter , dosimetry , linear particle accelerator , materials science , nuclear medicine , nuclear physics , radiation , dosimeter , geophysics , medicine
Results from beta testing of a commercially available three‐dimensional electron pencil beam algorithm (CMS FOCUS, Computerized Medical Systems, Inc. St. Louis, MO) are reported. Straight on beams were evaluated at normal and extended distances, and obliquely incident beams at angles up to 40°. Shaped electron fields with small circular cutouts, and narrow elongated, centered and offcentered, rectangular field shapes were investigated. Slab inhomogeneities were studied for lung and bone equivalent material, and isodose distributions for small inhomogeneities of these materials were compared with film and TLD measurements. All tests reported here were performed with electrons of 6, 12, and 20 MeV from a Cl‐1800 accelerator.