\chapter{The Web Browser CGI Interface}\label{webinterface}\index{Web Interface}%
\setheader{{\it CHAPTER \thechapter}}{}{}{}{}{{\it CHAPTER \thechapter}}%
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\section{Overview}\index{Web Interface,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{Requirements}\index{Web Interface,Requirements}%
   \begin{itemize}\itemsep=0pt
      \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 browsers support PNG.
  \end{itemize}
