Dose Distribution Indexes

Conformity Index (CI) as defined by ICRU

\begin{equation} \label{eq: CI} \textrm{CI} = \frac{V_{Rx}}{V_{PTV}} \end{equation}

Dose Gradient Index (DGI)

\begin{equation} \label{eq: DGI} \textrm{DGI} = \frac{V50 \%_{Rx}}{V100 \%_{Rx}} \end{equation}

Homogeneity Index (HI) as defined by ICRU 83

\begin{equation} \label{eq: HI} \textrm{HI} = \frac{(D2\% – D98\%)}{D50\%} \end{equation}