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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