\chapter{Concepts}\index{Concepts}%
\setheader{{\it CHAPTER \thechapter}}{}{}{}{}{{\it CHAPTER \thechapter}}%
\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}
