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

diff --git a/doc/ctsim-concepts.tex b/doc/ctsim-concepts.tex
index 9653a120ead80b7343711c9699b6a87b9dc600f9..21f94ddec9e999d3d39ea3f09613f51bbf824f0d 100644 (file)
--- a/doc/ctsim-concepts.tex
+++ b/doc/ctsim-concepts.tex
@@ -39,7 +39,7 @@ phantom.  Each line contains seven entries, in the following form:
 element-type cx cy dx dy r a
 \end{verbatim}
 The first entry defines the type of the element, either
-\rtfsp\texttt{rectangle}, \texttt{}, \texttt{triangle},
+\rtfsp\texttt{rectangle}, \texttt{ellipse}, \texttt{triangle},
 \rtfsp\texttt{sector}, or \texttt{segment}. \texttt{cx},
 \rtfsp\texttt{cy}, \texttt{dx} and \texttt{dy} have different
 meanings depending on the element type.
@@ -114,10 +114,10 @@ variable is the diameter of the circle surround the phantom, or the
 \emph{phantom diameter}. Remember, as mentioned above, the
 phantom dimensions are also padded by 1\%.
 
-The other important geometry variables for scanning objects are the
-\emph{view ratio}, \emph{scan ratio}, and \emph{focal length ratio}.
-These variables are all input into \ctsim\ in terms of ratios rather
-than absolute values.
+The other important geometry variables for scanning phantoms are
+the \emph{view diameter}, \emph{scan diameter}, and \emph{focal
+length}. These variables are all input into \ctsim\ in terms of
+ratios rather than absolute values.
 
 \subsubsection{Phantom Diameter}
 \begin{figure}
@@ -165,7 +165,7 @@ By default, the entire \emph{view diameter} is scanned. For
 experimental purposes, it may be desirable to scan an area either
 larger or smaller than the \emph{view diameter}. Thus, the concept
 of \emph{scan ratio}, \latexonly{$s_r$,}\latexignore{\emph{SR},}
-is born. The scan diameter
+is arises. The scan diameter
 \latexonly{$s_d$}\latexignore{\emph{Sd}} is the diameter over
 which x-rays are collected and is defined as \latexonly{$$s_d =
 v_d s_r$$}\latexignore{\\$$\emph{Sd = Vd x SR}$$\\} By default and
@@ -260,9 +260,9 @@ Since in normal scanning $s_r$ = 1, $\alpha$ depends only upon the
 
 \subsubsection{Detector Array Size}
 In general, you do not need to be concerned with the detector
-array size. It is automatically calculated by \ctsim. For those
-interested, this section explains how the detector array size is
-calculated.
+array size. It is automatically calculated by \ctsim. For the
+particularly interested, this section explains how the detector
+array size is calculated.
 
 For parallel geometry, the detector length is equal to the scan
 diameter.