[Evaluation of Stability and Reliability of the Measurement of Absorbed Dose-to-water for an HDR Ir Sandwich Setup Phantom].

Purpose: In this study, we evaluated the stability and reliability of absorbed dose-to-water for an HDR Ir sandwich setup phantom method by comparing measurements with absorbed dose-to-water determination based on the AAPM TG-43 protocol.

Methods: The sandwich setup phantom was designed with a dedicated device for two ion chamber measurements of absorbed dose-to-water for a mHDR-v2r Ir brachytherapy source is presented. To test the reliability of sandwich setup phantom of measurements with absorbed dose-to-water, we were compared with values based on AAPM TG-43 protocol and evaluated temporal variations of the measurement, intra-rater reliability.