Purpose To update and extend the Carleton Laboratory for Radiotherapy Physics (CLRP) Eye Plaque (EP) dosimetry database for low‐energy photon‐emitting brachytherapy sources using egs_brachy, an open‐source EGSnrc application. The previous database, CLRP_EPv1, contained datasets for the Collaborative Ocular Melanoma Study (COMS) plaques (10–22 mm diameter) with 103Pd or 125I seeds (BrachyDose‐computed, 2008). The new database, CLRP_EPv2, consists of newly calculated three‐dimensional (3D) dose distributions for 17 plaques [eight COMS, five Eckert & Ziegler BEBIG, and four others representative of models used worldwide] for 103Pd, 125I, and 131Cs seeds. Acquisition and validation methods Plaque models are developed with egs_brachy, based on published/manufacturer dimensions and material data. The BEBIG plaques (modeled for the first time) are identical in dimensions to COMS plaques but differ in elemental composition and/or density. Previously benchmarked seed models are used. Eye plaques and seeds are simulated at the center of full‐scatter water phantoms, scoring in (0.05 cm)3 voxels spanning the eye for scenarios: (a) “HOMO”: simulated TG43 conditions; (b) “HETERO”: eye plaques and seeds fully modeled; (c) “HETsi” (BEBIG only): one seed is active at a time with other seed geometries present but not emitting photons (inactive); summation over all i seeds in a plaque then yields “HETsum” (includes interseed effects). For validation, doses are compared to those from CLRP_EPv1 and published data. Data format and access Data are available at https://physics.carleton.ca/clrp/eye_plaque_v2, http://doi.org/10.22215/clrp/EPv2. The data consist of 3D dose distributions (text‐based EGSnrc “3ddose” file format) and graphical presentations of the comparisons to previously published data. Potential applications The CLRP_EPv2 database provides accurate reference 3D dose distributions to advance ocular brachytherapy dose evaluations. The fully‐benchmarked eye plaque models will be freely distributed with egs_brachy, supporting adoption of model‐based dose evaluations as recommended by TG‐129, TG‐186, and TG‐221.
To update and extend the Carleton Laboratory for Radiotherapy Physics (CLRP) Eye Plaque (EP) dosimetry database for low-energy photon-emitting brachytherapy sources using egs brachy, an open-source EGSnrc application. The previous database, CLRP EPv1, contained datasets for the Collaborative Ocular Melanoma Study (COMS) plaques (10-22 mm diameter) with 103 Pd or 125 I seeds (BrachyDose-computed, 2008). The new database, CLRP EPv2, consists of newlycalculated 3D dose distributions for 17 plaques [8 COMS, 5 Eckert & Ziegler BEBIG, and 4 others representative of models used worldwide] for 103 Pd, 125 I, and 131 Cs seeds. Acquisition and Validation Methods: Plaque models are developed with egs brachy, based on published/manufacturer dimensions and material data. The BEBIG plaques (modelled for the first time) are identical in dimensions to COMS plaques but differ in elemental composition and/or density. Previously-benchmarked seed models are used. Eye plaques and seeds are simulated at the centre of fullscatter water phantoms, scoring in (0.05 cm) 3 voxels spanning the eye for scenarios: (i) 'HOMO': simulated TG43 conditions; (ii) 'HETERO': eye plaques and seeds fully modelled; (iii) 'HETsi' (BEBIG only): one seed is active at a time with other seed geometries present but not emitting photons (inactive); summation over all i seeds in a plaque then yields 'HETsum' (includes interseed effects). For validation, doses are compared to those from CLRP EPv1 and published data.
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