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Dose (Gy)
Step 1:
Determine the uncertainty
s
for the dose measurement,
yielding the
probability distribution for the true dose
.
C
a
Dose measurement
= Dm
Dm + C
a
/2
Dm - C
a
/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
a
.
Error probability = (1-CL)/2
(i.e. 2.5% when CL=95%)
From Jörgen Olofsson (Dose Modeling and dose verification ESTRO COURSE)