Feasibility of using micro silica bead TLDs for in-Vivo dosimetry of CT-based HDR prostate brachytherapy: An experimental and simulation study

Abstract

PurposeFeasibility of silica-based dosimeters for IVD of HDR prostate brachytherapy. Material and methodsPlastic dosimeter holders and a water-fillable prostate phantom were built in-house. Interstitial prostate brachytherapy and Monte Carlo simulations were performed. The treatment planning, Monte-Carlo simulation, and dosimetry results were compared. ResultsThe relative differences between TLD-TPS, TLD-MCNP, and TPS-MCNP were 0.2–6.9 %, 0.5–6.5 %, and 0.6–6.3 %, respectively. ConclusionMicro-silica bead dosimeters can perform offline in situ quality assurance in HDR prostate brachytherapy.