Microsoft PowerPoint - Physics Bucharest

Breast

Exact match of field edges using ‘half’ beams



couch always at 0





AP-field: only use upper

half

of collimator



tangential fields: only use lower

half

of collimator



in junction plane exact match, defined by sides of leaves

(independent of leaf calibrations)

junction plane

through isocenter

focus

cranial

edge

central

axis

‘half’ beam

Simple geometry, complex dosimetry