420-421 / 1726
27
Take home message: nodal CTV
Margins add to considerable irradiation of normal tissue
PTV margin for elective target volume:
7-10mm margin without daily image guidance
5mm margin with daily image guidance and bony fusion
Potential in pelvic elective radiotherapy to reduce irradiated
volume by 40% with IMRT and daily IGRT (2500cc → 1500cc)