ROPES eye plaque dosimetry: commissioning and verification of an ophthalmic brachytherapy treatment planning system

7th International Conference on 3D Radiation Dosimetry

Poder, J.^1 ; Annabell, N.^2 ; Geso, M.^2 ; Alqathami, M.^2 ; Corde, S.^1

Radiation Oncology Dept., Prince of Wales Hospital, Randwick, NSW, Australia^1

School of Medical Sciences, RMIT University, Melbourne, VIC, Australia^2

关键词: Brachytherapy;    Central axis;    Depth dose;    Fluorescence intensities;    Iodine-125;    Planning systems;    Plaque brachytherapy;    Treatment planning systems;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/444/1/012102/pdf
DOI  :  10.1088/1742-6596/444/1/012102

来源: IOP

【 摘 要 】

In this study, the Plaque Simulator™ eye plaque brachytherapy planning system was commissioned for ROPES eye plaques and Amersham Health model 6711 Iodine 125 seeds, using TG43-UI data. The brachytherapy module of the RADCALC® independent checking program was configured to allow verification of the accuracy of the dose calculated by Plaque Simulator™. Central axis depth dose distributions were compared and observed to agree to within 2% for all ROPES plaque models and depths of interest. Experimental measurements were performed with a customized PRESAGEm3-D type dosimeter to validate the calculated depth dose distributions. Preliminary results have shown the effect of the stainless steel plaque backing decreases the measured fluorescence intensity by up to 25%, and 40% for the 15 mm and 10 mm diameter ROPES plaques respectively. This effect, once fully quantified should be accounted for in the Plaque Simulator™ eye plaque brachytherapy planning system.