404 / 879
Dose (Gy)
Step 1:
Determine the uncertainty (
) for the dose
measurement, yielding the
probability distribution for the true dose
.
C
Dose measurement
= Dm
Dm + C
/2
Dm - C
/2
Action limits - Proposed philosophy
Step 2:
Set a confidence level CL for the true dose, e.g.
CL =95%, and determine the corresponding dose interval C
.
Error probability = (1-CL)/2
(i.e. 2.5% when CL=95%)
From Jörgen Olofsson (Dose Modeling and dose verification ESTRO COURSE)