Imaging for early stage breast cancer

IORT with electron beam

collimated electron beams (3 – 12 MeV)

visually defined target volume, no imaging

average target volume thickness by measurements

cylindrical applicator with 3 – 10 cm diameter

standard dose distributions

skin is kept at a distance from applicator (retraction)

disc-shaped shield to protect thoracic wall

no need for OR shielding (only electron, self-shielded)

Veronesi et al. Breast J, 9:106-112. 2003