SU-E-T-528: Appraisal of Acorus XB and Convolution Dose Algorithms in Field Junction of Breast Tangential/superclavicular Fields

Medical Physics
Tao HanMohammad Salehpour

Abstract

Dose accuracy injunction regions of breast-tangential therapy is a challenge, and inaccurate dose predictions may lead to unreal hot/cold spots. Availability of the novel deterministic radiation transport method Acuros XB (AXB) provides a potential for more accurate dose predictions. This study assesses relative dose accuracies of this and the widely used other algorithms: collapsed cone convolution (CCC) and anisotropic analytical algorithm (AAA) against film measurements. A typical tangential and superclav fileld combination was planned for an anthropomorphic body phantom using Pinnacle-9.0 treatment-planning system (TPS). The created plan employing 6MV beam was delivered to the phantom on a Varian linac. In region of the field junction of tangentials & superclav, films (EBT2) were placed in coronal planes at two depths (∼ 2 and 4 cm). Optical density was measured along and ± 5mm away from the field-match line, and converted to dose using film-calibration curve specific to the batch of film. The same plan was also imported to Eclipse TPS using an import filter written in MATLAB. Algorithms Pinnacle CCC 9.0, Eclipse AAA 10.0.24 and AXB 11.0.3 were used for calculations. Comparison of the measured doses (assumed as gold standar...Continue Reading

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