\setfooter{\thepage}{}{}{}{}{\thepage}%
\winhelponly{$$\image{3cm;3cm}{logo-huge}$$}%
-
+\htmlonly{$$\image{3cm;3cm}{logo-huge.gif}$$}%
Computed Tomography is a technique for estimating the interior of an object
from measurement of radiation collected around the object. This radiation
can be either projected through or emitted from the object.
\ctsimtext can be executed without any parameters. In that case, \ctsimtext
offers a command-line to enter the function-names and their parameters. The output of the command is displayed. Further commands may be given to \ctsimtext. The shell is exited by the {\tt quit} command.
-\ctsimtext can also be called to execute a single command. This is especially useful for batch files containing multiple \ctsimtext commands. This is invoked by calling {\tt ctsimtext function-name parameters...}.
+\ctsimtext can also be called to execute a single command. This is especially useful for batch files containing multiple \ctsimtext commands. This is invoked by calling \par
+{\tt ctsimtext function-name parameters...}.
-The following function names are available:
+The available functions are:
\section{if1}\label{if1}\index{ctsimtext,if1}%
Perfoms math functions on a single image.
Reconstructs the interior of an object from a projection file.
\usage
-\begin{itemize}\itemsep=0pt
- \item Filter \par
- Selects which filter to apply to each projection. To
- properly reconstruct an image, this filter should be multiplied
- by the absolute value of distance from zero frequency.
+\begin{twocollist}
+\twocolitemruled{{\bf Parameter}}{{\bf Options}}
+\twocolitem{{\bf --filter}}{Selects which filter to apply to each projection. To properly reconstruct an image, this filter should be multiplied
+by the absolute value of distance from zero frequency.
\begin{itemize}\itemsep=0pt
\item abs_bandlimit
\item abs_cosine
\item abs_hamming
- \end{itemize}
-
- \item Filter Parameter \par
- Sets the alpha level for Hamming
- window. At setting of 0.54, this equals the Hanning window.
-
- \item Filter Method
- \begin{itemize}\itemsep=0pt
- \item convolution
+ \end{itemize}}
+ \twocolitem{{\bf --filter-parameter}}{Sets the alpha level for Hamming
+ window. At setting of 0.54, this equals the Hanning window.}
+ \twocolitem{{\bf --filter-method}}{Selects the filtering method. For large numbers of detectors, {\tt rfftw} is optimal. For smaller numbers of detectors, {\tt convolution} might be a bit faster.
+\begin{itemize}\itemsep=0pt
+\item convolution
\item fourier
\item fourier_table
\item fftw
\item rfftw
- \end{itemize}
-
- \item Filter Generation
- \begin{itemize}\itemsep=0pt
- \item direct
- \item inverse_fourier
- \end{itemize}
-
- \item Interpolation
- \begin{itemize}\itemsep=0pt
- \item nearest
- \item linear
- \end{itemize}
-
- \item Backprojection
- \begin{itemize}\itemsep=0pt
- \item trig
- \item table
- \item diff
- \item diff2
- \item idiff2
- \item idiff3
- \end{itemize}
-
- \item Zeropad
- \item Preinterpolation Factor
+\end{itemize}}
+ \twocolitem{{\bf --filter-generation}}{Selects the filter generation. With convolution, {\tt direct} is the proper method to select. With any of the frequency methods, {\tt inverse-fourier} is the best method.
+\begin{itemize}\itemsep=0pt
+\item direct
+ \item inverse-fourier
+\end{itemize}
+}
+ \twocolitem{{\bf --interpolation}}{Interpolation technique. {\tt linear} is optimal.
+\begin{itemize}\itemsep=0pt
+\item nearest
+\item linear
\end{itemize}
+}
+ \twocolitem{{\bf -backprojection}}{Selects the backprojection technique. A setting of {\tt idiff3} is optimal.
+\begin{itemize}\itemsep=0pt
+\item trig
+\item table
+\item diff
+\item diff2
+\item idiff2
+\item idiff3
+\end{itemize}
+}
+\twocolitem{{\bf --zeropad}}{ Zeropad factor. A setting of {\tt 1} is optimal.}
+
+ \twocolitem{{\bf --preinterpolate}}{Selects preinterpolation interpolation technique and sets the preinterpolation factor. Currently, this is experimental and does not work well.}
+\end{twocollist}
\chapter{The Web Browser CGI Interface}\label{webinterface}\index{Web Interface}%
\setheader{{\it CHAPTER \thechapter}}{}{}{}{}{{\it CHAPTER \thechapter}}%