2017 Imaging for Physicists Coursebook

Intra-fraction displacement of bone and tumor

• Displacement of tumor during treatment (40 minutes) can be up to 6 mm • Part of this is due to motion of the patient’s bony anatomy • Part is due to base-line shift • Correlation is high in L-R direction, poorer in other directions

Sonke et al. 2008. Int J Radiat Oncol Biol Phys. 74:567-574