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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

Film EBT - Calc

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

Major difference between versions was the

resolution of the fluence matrix

2.5mm

vs

0.3125mm

6MV

SSD=100cm

@6cm depth

MLC fields

40