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Dosimetric accuracy of the ITP™ inverse treatment planning system
Author(s) -
Olch Arthur J.
Publication year - 2002
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 - 10.1118/1.1513162
Subject(s) - multileaf collimator , dosimetry , nuclear medicine , ionization chamber , radiation treatment planning , collimator , radiation therapy , linear particle accelerator , relative biological effectiveness , dosimeter , medicine , medical physics , beam (structure) , radiation , ionization , optics , physics , radiology , ion , quantum mechanics
The dosimetric accuracy of the ITP™ system for intensity modulated radiation therapy was determined for 19 patient plans. Treatments were given with a Varian 2100C and a 120‐leaf multileaf collimator using step and shoot delivery. Both absolute dose, determined by an ionization chamber, and relative dose, determined by film, were assessed. It was found that absolute dose agreement was within 0.1 % ± 1.5 % , isodoses in the high dose–low gradient region were within 1.7 % ± 2 % , and the distance to agreement for isodoses between 20% and 90% was 1 . 4 mm ± 1 mm . This agreement is at least as good as that found for standard wedged fields in most treatment planning systems.