\setfooter{\thepage}{}{}{}{}{\thepage}%
\section{Overview}\label{conceptoverview}\index{Concepts,Overview}%
+
\section{Phantoms}\label{conceptphantom}\index{Concepts,Phantoms}%
+\subsection{Overview}\label{phantomoverview}\index{Concepts,Phantoms,Overview}%
+\subsection{Phantom Elements}\label{phantoelements}\index{Concepts,Phantoms,Elements}
+\subsubsection{ellipse}
+\subsubsection{rectangle}
+\subsubsection{triangle}
+\subsubsection{sector}
+\subsubsection{segment}
+
\section{Scanner}\label{conceptscanner}\index{Concepts,Scanner}%
+\subsection{Geometries}
+\subsection{Focal Length}
+\subsection{Field of View}
+
\section{Reconstruction}\label{conceptreconstruction}\index{Concepts,Reconstruction}%
+\subsection{Filtered Backprojection}