Physics Bucharest 2017

VMAT - Planning vs Deliverability

One arc or more arcs? (coplanar – non-coplanar – partial arcs)

• For most of the commercial planning solutions, no more than 2- arcs are needed • For complex cases, 2-arcs make it easier to connect the apertures thereby offering the optimizer more freedom, leading to significantly improved dose conformality and homogeneity

• Pushing the quality of the treatment plan decreases monitor unit efficiency and increases treatment time