ICRU 89

Question 1

ICRU 89 key points

Answer 1

1.defines volumes and adaptive brachy
2.2. don’t use PTV in brachy- significantly changes dose to CTV
3. volumetric reporting of OARs
4. using EQD2 for dose reporting
5. report D98%, D90%

Question 2

CTV-adapt

Answer 2

residual GTV and surrounding pathologic tissue

Question 3

high risk CTV

Answer 3

includes residual GTV and whole cervix and adjacent residual pathologic tissue

Question 4

residual GTV

Answer 4

residual GTV at time of brachy, after tx (EBRT) assumed sufficient to control microscopic disease

-it is possible it has no residual disease compared to GTV at diagnosis (GTV init)

Question 5

intermediate risk CTV

Answer 5

CTV high risk + margins
-10 mm in SI and lateral and 5 mm in AP

Question 6

low risk CTV

Answer 6

in advanced cervical cancer, includes whole parametria, whole uterus, upper part of vagina, AP spaces towards bladder and rectum