Modern Bt Techniques - Florence 2016

Quality Parameters and Indices

Conformity based

- External Volume Index EI

How much is the extension of D ref

outside the target volume

  

  

V

c

ref tissue,

1

=

− =

EI

x100

100 xc

1

PTV

c

2

V

is the normal tissue volume covered by D ref

tissue,ref

PTV is the target volume c 1 and c 2

are the two coefficients of COIN

Meertens H, Borger J et al. Nucletron International ; 300–306 1994.