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\title{CTSim - An Open-Source Computed Tomography Simulator} 
\author{Kevin Rosenberg, MD\footnote{San Juan Regional Medical Center, 801 W. Maple, Farmington NM 87401. Phone: (505) 599-6103. E-mail: kevin@rosenberg.net}} 
\date{July 2000} 
\maketitle 

\chapter{Introduction} 
Computed Tomography is the process of taking projection of X-ray data
though and object and using sophisticated mathematics to estimate
information about the interior of that object.

\chapter{Installation}
\subsection{Requirements}
\begin{itemize}

	\item Apache or other CGI compatible web server

	\item Perl (version 4.0 or higher)

	\item A client web browser than can display PNG files. Most
	current web browswer do support PNG.

\end{itemize}

\subsection{Download}
\subsection{Install Binary Distribution}
\subsection{Build From Sources}

\chapter{The Programs} 

\section{ctsim - The Graphical User Interface}
\ctsim\ is the graphical shell for the CTSim project. It is
written using the wxLibrary for cross-platform compatibility with GTK,
Motif, and Microsoft Windows.

\ctsim\ incorporates most of the capabilities of the CTSim
project. There are still functions that are only available to the
command line tools.

\subsection{Usage}
ctsim [OPTIONS] [files to open...]

\ctsim\ can open projection files and image files.

\section{The Web Browser CGI Interface}
\subsection{Overview}
The CGI program {\tt ctsim.cgi} takes projections of a standard
phantom object, performs reconstruction, and then compares the
rasterized phantom object with the reconstruction. The comparison is
performed both visually by an image subtraction as well as by standard
statistics as described by Herman\cite{HERMAN80}.

\section{tools - The Command Line Interface}
\subsection{phm2pj}
Converts a phantom object to a set of projections

{\tt phm2pj} simulates the process of collection of X-Ray projection data
such as collected by a CT scanner.

\subsection{pjrec}

\subsection{phm2if}

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