237 / 1726
Repetitive Imaging and Repetitive Planning:
T
arget regression during treatment in the presence of organ motion and deformation can
mitigate the need for a replan or … everything may happen if a small PTV margin is applied
Pretreatment CTV
Pretreatment PTV
CTV at CT scan 1
week after
treatment start
Imaging protocols MRI and CT
Changes during EBRT and IGABT (Interaction)
Week 4
CTV motion and
regression after 4
weeks
Stewart et al. IJROBP 2010
Imaging protocols CT and MRI, JCA Dimopoulos, P Petrow, Prague, Czech Republic, 22.10.2017 - 26.10.2017