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[ctsim.git] / doc / ctsim-gui.tex

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@@ -1,6 +1,7 @@
 \chapter{The Graphical User Interface}\label{ctsim}\index{ctsim}%
 \setheader{{\it CHAPTER \thechapter}}{}{}{}{}{{\it CHAPTER \thechapter}}%
-\setfooter{\thepage}{}{}{}{\small Manual v0.2}{\thepage}%
+\ctsimfooter%
+
 
 \section{Overview}
 \ctsim\ is the graphical shell for the CTSim project. It utilizes
@@ -213,8 +214,82 @@ image.
 
 \subsection{Reconstruct - Filtered Backprojection Dialog}
 This dialog sets the parameters for reconstructing an image from projections
-using the Filtered Backprojection technique. The parameters are identical
-to those for the \helprefn{pjrec}{pjrec} program.
+using the Filtered Backprojection technique.
+
+
+\begin{twocollist}
+\twocolitemruled{\textbf{Parameter}}{\textbf{Options}}
+\twocolitem{\textbf{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}
+} \twocolitem{\textbf{Hamming parameter}}{Sets the alpha level for
+Hamming   window. At setting of 0.54, this equals the Hanning
+window.}
+
+\twocolitem{\textbf{Filter Method}}{Selects the filtering method.
+For large numbers of detectors, \texttt{rfftw} is optimal. For
+smaller numbers of detectors, \texttt{convolution} might be a bit
+faster.
+\begin{itemize}\itemsep=0pt
+\item convolution
+\item fourier
+\item fourier\_table
+\item fftw
+\item rfftw
+\end{itemize}
+}
+
+\twocolitem{\textbf{Interpolation}}{Interpolation technique.
+\texttt{cubic} is optimal when many projections are taken and the
+data is smooth. Otherwise, \texttt{linear} gives better results.
+Linear is also much faster than cubic interpolation.
+
+\begin{itemize}\itemsep=0pt
+\item nearest
+\item linear
+\item cubic
+\end{itemize}
+}
+\end{twocollist}
+
+\subsection{Advanced Options}
+
+These options are only visible if \emph{Advanced Options} has been
+selected in the \texttt{File/Preferences} dialog. These parameters
+default to optimal settings and don't need to be adjusted except
+by expert users.
+
+\begin{twocollist}
+\twocolitem{\textbf{Backprojection}}{Selects the backprojection
+technique. A setting of \texttt{idiff} is optimal.
+\begin{itemize}\itemsep=0pt
+\item trig
+\item table
+\item diff
+\item idiff
+\end{itemize}
+}
+
+\twocolitem{\textbf{Filter Generation}}{Selects the filter
+generation. With convolution, \texttt{direct} is the proper method
+to select. With any of the frequency methods,
+\texttt{inverse-fourier}is the best method.
+\begin{itemize}\itemsep=0pt
+\item direct
+\item inverse-fourier
+\end{itemize}
+}
+
+\twocolitem{\textbf{Zeropad}}{Zeropad factor when using
+frequency-based filtering. A setting of \texttt{1} is optimal.}
+
+\end{twocollist}
 
 \section{Plot Menus}
 \subsection{File - Properties}