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Recommendation for reporting
•
Rationale for
SRT near-maximum
and
near-minimum dose
:
Ø
ICRU 83
introduced
D
2%
and
D
98%
Ø
An absorbed dose is reported that is NOT DEPENDING on a single
computation point and suffers less from sampling errors and
calculation uncertainties.
Ø
ICRU 91
, for small PTV, SRT near-maximum dose is
D
V
, where V
represents a minimal absolute volume element within which the
absorbed dose can be calculated to sufficient accuracy
.
Ø
This volume element needs to be chosen taking into account the
calculation grid size and considerations related to dose-calculation
accuracies in a single voxel.
Ø
Turns out that absolute volumes of
30-35 mm
3
seem adequate
(Benedict 2010, Roberge 2015).
SBRT 2017 - D. Verellen