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Small fields: relative dosimetry in practice
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
=
,
,
=
1
ම , ,
radiation field
Georg
et al
, 2
nd
ESTRO Forum, Pre-meeting workshop 2013