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IMRT

Isocentre placement

Not crucial but consider MLC

carriage and IGRT match

Beam arrangement

Odd number of non opposing

5, 7, 9

Field size

Generated during the leaf motion

calculator

Consider fixed jaws (shoulders,

hips, ineffective fluence)

Collimator angle

Consider for large fields (MLC

direction)

Dose rate

400MU/min

VMAT

Isocentre placement

Not crucial but consider MLC

carriage and IGRT match

May need multiple isocentres

Beam arrangement

SA vs. multiple arcs

Partial arcs, avoidance sectors

Field size

Automatic or manual

View the arc/s

Collimator angle

“Off zero” and counter coll’d

Dose rate

600MU/min