Advanced Skills in Modern Radiotherapy 2018

ICRU 62 (in addition to ICRU 50)

• Introduces the Conformity Index : CI= treated volume/ PTV

• Recommendations on anatomical and geometrical margins

• Internal Margins : IM are margins integrating physiological movements (breathing, bowel/ rectum/ bladder repletion, swallowing…)

• Internal Target Volume : ITV is defined as the CTV taking into account Internal Margins