128 / 1161
Target volumes - CTV
•
Concept that the CTV contains all the sub-clinical disease with a
certain probability
➢
Introduced in ICRU 83 (2010)
•
No consensus as to what that probability is
➢
Probability of ~ 90-95% may be reasonable
➢
Should it be lower or higher?
➢
(i.e. don’t treat if probability <5% or 10%)
•
Might depend on dose at edge of treated volume …