Evaluation of OARtrac Real-Time in Vivo Dosimetry for High Dose Rate Prostate Brachytherapy

Patient dose verification is an important part of radiation oncology; it gives the physician and physicist confidence that the treatment planning system is accurately calculating the dose the patient is receiving. There are several options available for external beam patient dosimetry, but due to high dose gradients around the source, there are few options for verifying dose in brachytherapy. OARtrac (AngioDynamics, Latham NY), a real-time in vivo dosimetry system that uses water equivalent micro plastic scintillating detectors (PSD), could be the solution to patient dose verification for brachytherapy. The goals of this project are to better understand the OARtrac in vivo dosimetry system and evaluate the feasibility of using the system for real-time in vivo dosimetry for high dose rate (HDR) brachytherapy.