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Questions from the audience
•
Some careful considerations, some answers
…
Ø
SRS/SRT/SBRT what is the difference
§
A better definition would be “high-dose-per-fraction-high-precision-
techniques”, in any case the label “stereo” is outdated
…
but it sticks
(reimbursement?).
Ø
GTV to CTV margin: yes or no?
§
For benign lesions or functional intracranial SRS, GTV = CTV
§
Extracranial there might be situations where GTV and CTV represent
identical volumes. When this is the case,
the CTV should still be defined
.
§
Even if it can be assumed that the penumbra (dose fall-off) will be
sufficient to eradicate microscopic infiltrates.
Instead of assuming that
the penumbra will cover the undefined CTV, it is recommended to
formally assess the dose to the CTV
.
§
Moreover, physicians are pushing physicists to reduce the fall-off,
be careful what you ask for, we will get there
!
SBRT 2017 - D. Verellen