ASMR

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