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Treatment Planning
•
Treatment constraints:
!
PTV = GTV + 5mm
!
Dose prescription
#
Centrally located lesions
#
Lesions < 1cm from thoracic wall
#
Peripheral lesions
!
Dose prescription
#
Normalization: 100% @
isocentre
, D
1%
< 105%
#
95% of PTV covered by
prescription isodose
surface (i.e. 12 or 17Gy)
#
99% of PTV covered by 90% of
prescription isodose
surface
!
Dose constraints:
#
Conformity, low and high dose spillage …
#
Normal tissues …
Pencil Beam versus Monte Carlo Dose Calculation
4 x 12 Gy (Monte Carlo)
3 x 17 Gy (Monte Carlo)
•
Type B dose calculation algorithm
•
For details on plan acceptance see lecture Tuesday
SBRT 2015 - D. Verellen
47