IMRT 2018

Example Replan Lung

Find your uncertainties – calculate margins

Spinal cord

Different inter fractional shifts of GTV T and GTV N

Lung

We match on GTV T

We evaluate GTV N

N

Small margin (4-5 mm) from CTV T to PTV T

Large margin (7-8mm) from CTV N to PTV N

T

2 mm tolerance

5 mm tolerance

Hoffmann et al, Radioth Oncol116:64-9. 2015