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\section{Overview}\label{conceptoverview}\index{Concepts,Overview}%
-In CTSim, a phantom object, or a geometrical description of the object
+In \ctsim, a phantom object, or a geometrical description of the object
of a CT study is constructed and an image can be created. Then a
scanner geometry can be specified, and the projection data simulated.
Finally that projection data can be reconstructed using various user
controlled algorithms producing an image of the phantom or study object.
-In order to use CTSim effectively, some knowledge of how CTSim works
-and the approach taken is required. \ctsim deals with a variety of
+In order to use \ctsim\ effectively, some knowledge of how \ctsim\ works
+and the approach taken is required. \ctsim\ deals with a variety of
object, but the two we need to be concerned with are the 'phantom' and
the 'scanner'.
\section{Phantoms}\label{conceptphantom}\index{Concepts,Phantoms}%
\subsection{Overview}\label{phantomoverview}\index{Concepts,Phantoms,Overview}%
-CTSim uses geometrical objects to
+\ctsim\ uses geometrical objects to
describe the object being scanned: rectangles, triangles, ellipses,
sectors and segments. With these the standard phantoms used in the CT
literature (the Herman and the Shepp-Logan) can be constructed. In fact
-CTSim provides a shortcut to construct those phantoms for you. It also
+\ctsim\ provides a shortcut to construct those phantoms for you. It also
allows you to write a file in which the composition of your own phantom is
described.
than the bore! In this model, the scanner size or field of view would
be used as the standard length scale.
-However, CTSim takes another approach. I believe this approach arose
+However, \ctsim\ takes another approach. I believe this approach arose
because the "image" of the phantom produced from the phantom description
was being matched to the reconstruction image of the phantom. That is,
the dimensions of the 'before' and 'after' images were being matched.
the phantom rotated by 45 degrees, corresponding to the geometry of a
projection taken at that angle. Note that the fan beam now clips the top
and bottom corners of the bounding square. This illustrates that one may
-still be clipping the phantom, despite CTSim's best efforts. You have
+still be clipping the phantom, despite \ctsim\'s best efforts. You have
been warned.
\begin{figure}
\includegraphics[width=\textwidth]{ctsimfig5.eps}
than the spatial domain. The technique is comprised of two sequential steps:
filtering projections and then backprojecting the filtered projections. Though
these two steps are sequential, each view position can be processed individually.
-This parallelism is exploited in the MPI versions of \ctsim where the data from
+This parallelism is exploited in the MPI versions of \ctsim\ where the data from
all the views are spread about amongst all of the processors. This has been testing
in a 16-CPU cluster with good results.
\subsubsection{Filter projections}
The projections for a single view have their frequency data multipled by
-a filter of absolute(w). \ctsim permits four different ways to accomplish this
+a filter of absolute(w). \ctsim\ permits four different ways to accomplish this
filtering. Two of the methods use convolution of the projection data with the
inverse fourier transform of absolute(x). The other two methods perform an fourier
transform of the projection data and multiply that by the absolute(x) filter and
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\section{Overview}
-\ctsim is the graphical shell for the CTSim project. It is
+\ctsim\ is the graphical shell for the CTSim project. It is
written using the wxLibrary for cross-platform compatibility with GTK,
Motif, and Microsoft Windows. It includes all of the functionality of
-the command-line tool {\tt ctsimtext} as well as image processing and visualization features.
+the command-line tool \ctsimtext\ as well as image processing and visualization features.
-\ctsim can open projection files, image files, phantom definition files, and plotfiles.
+\ctsim\ can open projection files, image files, phantom definition files, and plotfiles.
\usage
ctsim [OPTIONS] [files to open...]
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-\ctsimtext is a master shell for all of the command-line utilities.
+\ctsimtext\ is a master shell for all of the command-line utilities.
\usage
-\ctsimtext can be executed without any parameters. In that case, \ctsimtext
+\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 \par
+\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 available functions are:
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.
-\rtfsp\ctsim simulates the process of projecting X-rays through a phantom object.
-\rtfsp\ctsim can then reconstruct the interior of the object from the projections
+\rtfsp\ctsim\ simulates the process of projecting X-rays through a phantom object.
+\rtfsp\ctsim\ can then reconstruct the interior of the object from the projections
collected around the phantom object.
-The \ctsim package has two executable files: the graphical \helprefn{ctsim}{ctsim} and text \helprefn{ctsimtext}{ctsimtext} programs.
+The \ctsim\ package has two executable files: the graphical \helprefn{ctsim}{ctsim} and text \helprefn{ctsimtext}{ctsimtext} programs.
\include{ctsim-concepts}
projects / ctsim.git / commitdiff