1 \chapter{The Web Interface}\label{webinterface}\index{Web Interface}%
2 \setheader{{\it CHAPTER \thechapter}}{}{}{}{}{{\it CHAPTER \thechapter}}%
5 \section{Overview}\index{Web Interface,Overview}%
6 \ctsim\ can also be executed via a web browser. The CGI program
7 \texttt{ctsim.cgi} takes projections of a standard phantom object,
8 performs reconstruction, and then compares the rasterized phantom
9 object with the reconstruction. The comparison is performed both
10 visually by an image subtraction as well as by standard statistics
11 as described by Herman\cite{HERMAN80}.
13 \section{Requirements}\index{Web Interface,Requirements}%
14 \begin{itemize}\itemsep=0pt
15 \item Apache or other CGI compatible web server
17 \item Perl (version 4.0 or higher)
19 \item A client web browser than can display PNG files. Most
20 current web browsers support PNG.
22 \item A knowledgable system administrator. It is beyond the
23 scope of this manual to explain the installation of the CGI