Imaging for early stage breast cancer

Definition of coverage index (CI) and conformal index (COIN)

V PTV

ref

CI =

PTV

V

(%) = 100 x CI

100

V PTV

ref V PTV

ref

ref

COIN

=



PTV

Both indices (CI, COIN) have to be maximized during optimization CI and COIN can be used for both BT and IMRT