TH‐AB‐BRA‐02: Generation of 3D Dosimetric Reference Datasets for Commissioning and Validation of 192Ir Brachytherapy Model‐Based Dose Calculation Software

TL;DRAbstract

Purpose: Previously, generic HDR 192 Ir source and shielded applicator were designed by WG‐ MBDCA, the AAPM‐ESTRO‐ABG Working Group on model‐based dose calculation algorithms. TPS vendors have incorporated both into their TPS. A charge of WG‐MBDCA is to develop a limited number of well‐defined test cases and perform MBDCA dose calculations and comparisons. Here, we describe the test cases proposed, the 3D dosimetric data generation process and the 3D gamma analysis performed. Methods: A voxelized phantom of 512×512×512 voxels (HU=‐1024,Air), with each voxel being 1×1×1 mm 3 , containing a concentric cubic contour structure (HU=0,Water) of dimension 201×201×201 voxels, was created in the DICOM‐ RT format. Three configurations were tested: i) source located at the center with surrounding structure assigned to water to mimic TG‐43 conditions, ii) source displaced +7 cm along the × axis, iii) source located at the center with the shielded applicator in place. Advanced Collapsed‐cone Engine

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