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Key Concepts of VMAT
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Simultaneously changing 3 main features
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MLC leaf motion
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Gantry speed
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Variably dose rate
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Inverse planning based on Progressive Resolution
Optimisation Algorithm (PRO)
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PRO 3
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4 multi resolution levels
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All 178 control points are included in each level
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Internal logic
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Intermediate dose calculation
Image taken from: Jolly D, Alahakone D and Meyer J A RapidArc planning strategy for prostate with integrated boost. J Appl Clin Med Phys 2010