value of \texttt{1}.}
\end{twocollist}
+\subsection{File - Import}\label{IDH_DLG_IMPORT}
+This command allows the importing of non-\ctsim\ file formats into
+\ctsim. \texttt{PPM} and \texttt{PNG} formats will be read into an
+imagefile window. Color images will be converted to grayscale. If a
+\texttt{DICOM} library was linked in with your version of \ctsim,
+then you can also import \texttt{DICOM} projection files and image
+files.
+
\subsection{File - Preferences}\label{IDH_DLG_PREFERENCES}\index{Dialog!Preferences}
This command displays a dialog box that allows users to control
the behavior of \ctsim. These options are saved across \ctsim\ sessions.
This is especially instructive when scanning with divergent
geometries and the scan ratio is close to \texttt{1}.
+\subsubsection{Theta Range}\label{IDH_DLG_THETA_RANGE}
+This dialog box allows the constraint of Theta values for the
+T-Theta Sampling scattergram.
\subsection{Reconstruct - Filtered Backprojection}\label{IDH_DLG_RECONSTRUCTION}\index{Dialog!Reconstruction}
This command displays a dialog to set the parameters for reconstructing an image from projections