From: Monte Carlo simulation of the Varian TrueBeam flattened-filtered beams using a surrogate geometry in PRIMO
Beam
Ring interval [cm]
[0–1]
[1–2]
[2–3]
[3–4]
[4–5]
[5–6]
[0–6]
6
99.6
99.8
99.9
8
10
99.7
15
97.6
97.5
97.4