3 .TH "pjrec" "1" "" "Kevin Rosenberg" "Engineering"
5 pjrec \- reconstruction from projections
7 .B pjrec projection\-file image\-file nx\-image ny\-image [OPTIONS]
9 \fIpjrec\fP takes projection data from \fIraysum\-file\P and produces an
10 (IF) image file \fIimage\-file\fP, of size \fInx\-image\fP by
11 \fIny\-image\fP pixels, containing the reconstructed image.
13 \fIpjrec\fP accepts the following options, which control the
14 reconstruction algorithm:
17 Interpolation method during backprojection
21 Nearest neighbor interpolation
28 Preinterpolation factor (default = 1). Used only with frequency\-based
36 Abs * Bandlimiting (default)
67 Filter method before backprojections
71 Spatial filtering (default)
74 Frequency filtering with discete fourier
77 Frequency filtering with table lookup fourier
80 Fast Fourier Transform
84 Set zeropad level (default = 0). set n to number of powers to two to pad
86 .B \-\-filter\-generation
87 Filter Generation mode
91 Use direct filter in spatial or frequency domain (default)
94 Use inverse fourier transform of inverse filter
102 Trigometric functions at every point
105 Trigometric functions with precalculated table
111 Optimized difference method (default)
114 Optimized difference method with integer math
117 Highly\-optimized difference method with integer math
121 Alpha level for Hamming filter
124 Set tracing to level:
134 .B \-\-verbose Turn on verbose mode
136 .B \-\-debug Turn on debug mode
138 .B \-\-version Print version
140 .B \-\-help Print a terse help message
142 Kevin Rosenberg, M.D. <kevin@ctsim.org>
144 CTSim was begun in 1983 using MS\-DOS and an EGA display adapter. In
145 1999 it was ported to GNU/Linux and later ported to Microsoft Windows.