711 / 1578
•
High dose spillage:
Ø
Any dose > 105% of
PD
should be concentrated inside PTV
Ø
Volume (tissue outside PTV receiving > 105%
PD
) < 15% of PTV
volume
SBRT 2017 - D. Verellen
Volume sphere
−
PTV
,
>
105%
PD
(
)
Volume PTV
(
)
Volume sphere
−
PTV
,
>
50.4
Gy
(
)
Volume PTV
(
)
=
5.97
cm
3
39.8
cm
3
=
0.15
(
< 15%
)
PTV &
tissue heterogeneity &
dose prescription