ABSTRACT
PURPOSE: To validate the point-A dose and dose distribution of metal and resin applicators in comparison with those of TG-43U1. METHODS: The metal and resin applicators consisting of tandem and ovoid were modeled by the egs_brachy. The doses to point A and dose distributions considering each applicator were calculated and compared to those of TG-43U1. RESULTS: The dose to point A considering the metal applicator was 3.2% lower than that of TG-43U1, but there was no difference in the dose to point A considering the resin applicator. The dose distribution considering the metal applicator was lower than that of TG-43U1 at all calculation points, but there was no difference in the dose distribution considering the resin applicator at almost all calculation points. CONCLUSION: In this study, the dose distribution considering the metal applicator was lower than that of TG-43U1 at all calculation points, but there was no difference in the dose distribution considering the resin applicator at almost all calculation points. Therefore, TG-43U1 can accurately calculate the dose distribution when changing from the metal applicator to the resin applicator.
Subject(s)
Brachytherapy , Uterine Cervical Neoplasms , Female , Humans , Uterine Cervical Neoplasms/radiotherapy , Radiotherapy Dosage , Metals , Phantoms, Imaging , Monte Carlo Method , Radiotherapy Planning, Computer-Assisted , RadiometryABSTRACT
Herein, we investigate the use of agar and gelatin in a polymer gel dosimeter. The polymer gel is enclosed in a vinyl film to obtain a dosimeter of arbitrary shape and maintain the shape at room temperature. The resulting polymer gel dosimeter could preserve its shape across a wide temperature range. Excluding the surface region, the obtained dose distribution was within 3% of that determined in an ionization chamber.
