ESTRO Multidisciplinary Management of Breast Cancer 2017

Example: 2D imaging for APBI

3 gold markers (1.2 x 3mm) AP kV, lateral MV daily + MV acquisition (open fields) 1cm PTV

No evidence of migration Average shifts:

- 3mm AP - 2mm LR - 2mm sup inf

But displacements of up to 10 mm observed

Leonard et al IJROBP 2010

03/01/13