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How it works 3D – VMAT
EPID
EPID
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Mans A et. al. 3D dosimetric verification of volumetric-
modulated arc therapy by portal dosimetry,
Rad. Oncol. J. Eur. Soc. Ther. Rad. Onc. 2010: 94: 181-187.
Compare to TPS
EPID measured dose
3D Gamma