2017_SBRT_Course Book

Motion compensation techniques

• The concept of ITV does not mix very well with the definition of PTV .

?

M r

= α Σ 2 + β σ 2 + σ p

2 − βσ p

CTV

ITV

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

SBRT 2017 - D. Verellen