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Small static fields: Influence of low density medium

Differences between doses computed

between two versions of same model

AAA v8.6.15

vs

AAA v10.0.25

Major difference between versions was the

resolution of the

fluence matrix

2.5mm

vs

0.3125mm

Ong et al (2011) Med Phys 38(8), 4471-4479

Clinical VMAT plan

6MV

Measurement in

homogeneous

polystyrene

EBT film

Film

13% local difference for AAA8, 1mm