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IMRT fields = 2D modulation
Could (potentially) consider each leaf
pair separately
Preferable to consider 2D matrix and
group leaves
–
maximise segment area
–
minimise number of segments
73
ESTRO physics course 2017
Dynamic
More versatile - more intensity levels
Faster overall treatment time - beam stays on
Smooth transition - but depends on leaf speed
MU efficiency lower
Gantry rotation
VMAT/ RapidArc
74
ESTRO physics course 2017
IMRT delivery methods