ASMR 2017

Key Concepts of VMAT

• Simultaneously changing 3 main features  MLC leaf motion  Gantry speed  Variably dose rate

• Inverse planning based on Progressive Resolution Optimisation Algorithm (PRO)

• PRO 3 

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