Course book Advanced Treatment Planning 2018

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 …