Cover Imaging for Physicists

Mid-Ventilation scan

• GTV is defined on the mid-ventilation phase (phase closest to the

mean position of the tumor)

• Radiation treatment is possible during free breathing

• A PTV margin surrounds the GTV for delivery uncertainties and

breathing

Mid-ventilation

Wolthaus et al. 2006. Int J Radiat

Oncol Biol Phys. 65:1560-1571