Target Volume Determination 2015

Take home messages

• FDG-PET is value-added in the GTV-T determination. • Contrast CT is sufficient to define the GTV-N.

• The CTV-T margins are defined by an institutional or study protocol. • The CTV-N margins are 10 mm for IMRT & 13-15 mm for 3D-CRT. • The consensus 2015 guidelines specify OAR delineation. • Per-treatment target & OAR volume changes are individual. • Adaptive radiotherapy should become a standard, though a comprehensive treatment protocol should be thought out first.