Dose Course 2018_Flipping book

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.

Dublin 2018