Dose Course 2018_Flipping book

(some) Dose metrics from DVH’s

ICRU 83

D is highly sensitive to calculation and accuracy of CTV 98% ‘near minimum’ since D 100%

D ‘near maximum’ rather than previous maximum absorbed dose 2%

D D

−

%2

%98

HI

=

D

%50

1 D

max

DdV

) (

D

D

dD

=



mean

V

dD

0

D

is dose received by 50% of volume

median

If differential DVH is symmetric and unimodal for PTV then median and mean doses are nearly the same

Das et al JNCI 2008

Dublin 2018