TRUS-fluoroscopy fusion for intraoperative prostate brachytherapy dosimetry.

A fluoroscopic to TRUS fusion based approach for intraoperative prostate brachytherapy dosimetry was developed. Seed images were identified from multiple fluoroscopic images and reconstructed to determine the three dimensional distribution of the implanted seeds. Seeds identified from the TRUS images were used as fiducials for the registration between fluoroscopic and TRUS images. Dose analysis was then performed based on the fused images. A phantom study was performed to test this approach and a 3 mm registration error was observed. Radiation isodose contours were generated and superimposed on the TRUS images.