Quantitative analysis of brass compensators for commissioning of the Pinnacle planning system for IMRT.

ABSTRACT: Brass compensators for beam modulation present an alternative method for IMRT treatment planning to traditional dynamic leaf modulation. In this work, we present a detailed method to commission the Pinnacle treatment planning system for IMRT using brass compensators. Beam attenuation from various brass thicknesses were measured using an ion chamber, as well as a MapCHECK device, for a representative seven-field IMRT plan. We show that Pinnacle's parameters for compensators can be optimized to match the measured results while still maintaining the original open-beam model. Only Pinnacle's modified scatter factor and brass density value were adjusted. Beam attenuation in several brass slabs were optimized by minimizing a χ(2) function of measured and modeled data for several depths in solid

SUBMITTER: Gates LL 

PROVIDER: S-EPMC5690995 | biostudies-literature | 2015 Nov

REPOSITORIES: biostudies-literature