Structure | IR Definition | HR Definition |
---|---|---|
Gross target volume (GTV) | Prostate + extra capsular extension | Prostate + seminal vesicles + extra capsular extension |
Clinical target volume (CTV) | CTV = GTV | CTV = GTV |
Rectum | The outer wall of the rectum from the cranial border (where the rectum turns horizontally into the sigmoid colon), to the caudal border (defined as 15 mm caudal to the apex of the prostate) | |
Bladdera | Visible bladder |