Diapositive 1

Detector size: a) volume averaging

• Volume averaging is described mathematically using the

profile shape

and the

detector geometry

• The

volume averaging correction

is defined as the ratio of the absorbed dose to water at the

reference point in the water phantom in the absence of the detector to the mean absorbed dose to

water over the sensitive volume of the detector (still in the absence of the detector).

Point of dose

determination

Sensitive volume

of detector, V

ම , ,

radiation field

Georg

et al

, 2

ESTRO Forum, Pre-meeting workshop 2013