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•
MLC motion
and
MU
variation are to be constrained between
gantry samples to preserve continuous delivery
→
efficiency
constraints to the solution space
•
Maximum gantry
rotation speed
or jaws/MLC
modulation
speed
can be a limiting factor to the maximum specified dose rate
•
Optimization
→
find a trade off between deliverable - time consuming
– complexity - modeling
Accuracy
VMAT - Planning vs Deliverability
degrees of freedom