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Is the skull a suitable reference?
•
If visualization of the target is not possible, one has to
use the bony skull as a surrogate for the actual intra-
cranial target in IGRT
•
However, internal „motion of intra-cerebral tumor could
be caused by:
Ø
Tumor progression
Ø
Tumor shrinkage
Ø
Changes of peritumoral oedema
Ø
This is the same for invasive frame-based techniques
SBRT 2017 - D. Verellen
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