During needle insertion, the ultrasound will move in synch with the needle insertion (via optical tracking and motorized control of the ultrasound probe) in order to allow constant visualization of the needle tip during insertion. The depth of insertion of the ultrasound probe is limited by the stepper unit which it is attached to. After each needle insertion, C-arm fluoroscopy is briefly used to assess and confirm the positioning, and a Mick applicator (Mick Radio-Nuclear Instruments, Mount Vernon NY) will be used to place sources into the prostate via the needle. Following source placement the needle is removed, the needle positioner moves to the next needle position, and the procedure is repeated until all sources have been placed. After all sources are placed, a final set of fluoroscopic images is taken for confirmation and documentation.