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Key steps in HDR brachytherapy. (A) HDR brachytherapy involves insertion of afterloading catheters into the prostate under trans-rectal ultrasound (TRUS) guidance; (B) for CT planning, the template is locked and sutured to the perineum; (D) a CT image set is obtained and a dosimetric plan is generated. For TRUS-based planning, dosimetry is generated on the TRUS images (E) and patient can be treated without having to move or change position (F). HDR, high dose-rate.
