Physics Bucharest 2017

6/3/2017

Conformity Index

0 1 2 3 4 5 6 7 8

CI (Knoss et al.) CI (ICRU)

Conformity Index

NOTE: Conformity index is defined differently in different texts: RTOG /ICRU: CI= V treated to specific Iso-dose / V target 0 2 4 6 Volume of Isodose/Volume of PTV

8

The “ specific Iso-dose” is often prescription dose, 95% dose or 50% dose Both definitions CI close to 1 is ideal, provided ALL of PTV is covered. BE careful not to only look at CI, as lack of PTV coverage may lead to CI near 1.

5

Beam shaping and modulating techniques Conventional RT Only Jaws to limit the beam apertures, wedges to modulate the intensity

76. 2315





CI

7.3

%95

3. 626

Bladder Rectum

6

ESTRO physics course 2017