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Motion compensation techniques
•
The concept of
ITV
does not mix very well with the
definition of
PTV
.
•
Target volumes are too large
•
BUT:
Ø
Target coverage is ensured
Ø
Motion amplitude <10mm in majority of patients
Ø
Clinical data with ITV and SBRT is excellent
Ø
It is the most practical 4D solution
M
r
=
α
Σ
2
+
β σ
2
+
σ
p
2
−
βσ
p
CTV
ITV
PTV
?
SBRT 2017 - D. Verellen