ESTRO course Dose Modelling and Verification 2017

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Dose monitor chamber

Transmission ionization chamber that monitors and controls delivered dose (MU), dose rate, beam symmetry and flatness.

Varian True beam

• Dose (MU) determined by summing up all sectors, divided into two independent channels. • Symmetry determined through comparisons between left/upper and right/lower side. • Flatness (new on True Beam) is determined by comparing ratios between (A+B) and I or (C+D) and J.

T Knöös

Warsaw 2017