2017_IGRT course book

How much does it matter?

• Uncertainties from planning: ➢

Catching the tumour in a ”un-representative position” ➢ Under /over-estimating the tumour volume

• Uncertainties from delivery: ➢

Mis-registration on a given day (wrong alignment between beam and average tumour position) ➢ Interplay effect ➢ Anatomical changes