IMRT Course 2016

IMRT for Prostate Cancer

STRUCTURES TO BE OUTLINED AS ORGANS AT RISK

RECTUM

The circumference of the rectum should be outlined entirely. If

the anterior-posterior diameter of the rectum is > 5cm at any

level adjacent to the prostate, or is >3.5cm and deforming the

prostate, the patient should be re-scanned. The outlining should

extend to the bottom of the ischial tuberosities to the recto-

sigmoid junction. At the recto-sigmoid junction, the rectum and

the sigmoid will be outlined as different structures. The recto-

sigmoid junction will be defined as the level at which there is an

anterior inflection of the bowel.