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

diff --git a/doc/ctsim-concepts.tex b/doc/ctsim-concepts.tex
index 63d478c20ae2bae6e15a4f508efcd64ed4ae25a0..27d342a33b72062f926b846809afc8a727379829 100644 (file)
--- a/doc/ctsim-concepts.tex
+++ b/doc/ctsim-concepts.tex
@@ -6,7 +6,7 @@
 The operation of \ctsim\ begins with the phantom object.  A
 phantom object consists of geometric elements.  A scanner is
 specified and the collection of x-ray data, or projections, is
-simulated. That projection data can be reconstructed using various
+simulated. This projection data can be reconstructed using various
 user-controlled algorithms producing an image of the phantom
 object. These reconstructions can be visually and statistically
 compared to the original phantom object.
@@ -58,7 +58,7 @@ meanings depending on the element type.
 
 \subsubsection{ellipse}
 Ellipses use \texttt{dx} and \texttt{dy} to define the semi-major and
-semi-minor axis lengths, with the center of the ellipse at \texttt{(cx,cy)}.
+semi-minor axis lengths with the center of the ellipse at \texttt{(cx,cy)}.
 Of note, the commonly used phantom described by
 Shepp and Logan\cite{SHEPP74} uses only ellipses.
 
@@ -68,8 +68,8 @@ the center of the rectangle with respect to the origin.  \texttt{dx}
 and \texttt{dy} are the half-width and half-height of the rectangle.
 
 \subsubsection{triangle}
-Triangles are drawn with the center of the base at \texttt{(cx,cy)},
-with a base half-width of \texttt{dx} and a height of \texttt{dy}.
+Triangles are drawn with the center of the base at \texttt{(cx,cy)
+and a base half-width of \texttt{dx} and a height of \texttt{dy}.
 Rotations are then applied about the center of the base.
 
 \subsubsection{segment}
@@ -108,7 +108,7 @@ construction of the scanner and can not be changed. \ctsim,
 being a very flexible simulator, gives tremendous options in
 setting up the geometry for a scan.
 
-In general, the geometry for a scan all starts with the size of
+The geometry for a scan starts with the size of
 the phantom being scanned. This is because \ctsim\ allows for
 statistical comparisons between the original phantom image and
 it's reconstructions. Since CT scanners scan a circular area, the
@@ -358,10 +358,10 @@ Images can be compared statistically. Three measurements can be calculated
 by \ctsim. They are taken from the standard measurements used by
 Herman\cite{HERMAN80}. They are:
 
-\begin{twocollist}
-\twocolitem{\textbf{$d$}}{The normalized root mean squared distance measure.}
-\twocolitem{\textbf{$r$}}{The normalized mean absolute distance measure.}
-\twocolitem{\textbf{$e$}}{The worst case distance measure over a \latexonly{$2\times2$}\latexignore{\emph{2 x 2}} pixel area.}
+\begin{itemize}\itemsep=0pt
+\item[-]\textbf{$d$}\quad The normalized root mean squared distance measure.
+\item[-]\textbf{$r$}\quad The normalized mean absolute distance measure.
+\item[-]\textbf{$e$}\quad The worst case distance measure over a \latexonly{$2\times2$}\latexignore{\emph{2 x 2}} pixel area.
 \end{twocollist}
 
 These measurements are defined in equations \ref{dequation} through \ref{bigrequation}.