689 / 1578
That was easy …
•
What about clinical practice?
Ø
Requiring 100 % confidence for adequately treating the CTV would
result in unreasonably large margins.
Ø
To quote ICRU 83, case number B3. Adenocarcinoma of the
Prostate: “
The PTV-T was defined by adding an anisotropic margin to
the CTV. This margin was 7 mm posteriorly, and 10 mm in all other
directions
…”
•
But where does the 7 mm come from
??????
SBRT 2017 - D. Verellen