Quantifying I placement accuracy in prostate brachytherapy using postimplant transrectal ultrasound images.

Purpose: The quality of a prostate brachytherapy implant depends on the accurate placement of sources. This study quantifies the misplacement of I sources from the intended location using intraoperative ultrasound images.

Methods And Materials: I sources were manually identified in the postimplant ultrasound images and compared to the preoperative plan.