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The dosimetric properties of an intraoperative radiation therapy applicator system for a Mevatron‐80
Author(s) -
Nelson Charles E.,
Cook Richard,
Rakfal Susan
Publication year - 1989
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 - 10.1118/1.596338
Subject(s) - collimator , flatness (cosmology) , dosimetry , optics , linear particle accelerator , radiation , beam (structure) , medical physics , materials science , radiation therapy , nuclear medicine , physics , medicine , radiology , cosmology , quantum mechanics
An applicator system for intraoperative radiation therapy has been fabricated which does not require physical docking with the accelerator. A dosimetric study has been completed which documents the properties of this system for a variety of electron beam energies, applicator sizes, collimator settings, both primary and secondary, and source–surface distance (SSD) settings. Sensitivity of the system to common misalignment errors was also determined. Results indicate (a) applicator leakage of less than 5%, (b) beam flatness to within plus or minus 5% at the d MAX with a single primary collimator setting, (c) smooth changes in output with cone size, beam energy and SSD, and (d) negligible changes in dose distributions within alignment errors permitted by the system.