5 pjrec - reconstruction from raysum projections
8 .B pjrec projection-file image-file nx-image ny-image [OPTIONS]
11 \fIpjrec\fP takes projection data from \fIraysum-file\P and produces an
12 (IF) image file \fIimage-file\fP, of size \fInx-image\fP by
13 \fIny-image\fP pixels, containing the reconstructed image.
16 \fIpjrec\fP accepts the following options, which control the
17 reconstruction algorithm:
20 Interpolation method during backprojection
24 Nearest neighbor interpolation
31 Preinterpolation factor (default = 1). Used only with frequency-based
39 Abs * Bandlimiting (default)
70 Filter method before backprojections
74 Spatial filtering (default)
77 Frequency filtering with discete fourier
80 Frequency filtering with table lookup fourier
83 Fast Fourier Transform
87 Set zeropad level (default = 0). set n to number of powers to two to pad
89 .B \-\-filter-generation
90 Filter Generation mode
94 Use direct filter in spatial or frequency domain (default)
97 Use inverse fourier transform of inverse filter
101 Backprojection Method
105 Trigometric functions at every point
108 Trigometric functions with precalculated table
114 Optimized difference method (default)
117 Optimized difference method with integer math
120 Highly-optimized difference method with integer math
124 Alpha level for Hamming filter
127 Set tracing to level:
149 .B \-\-verbose Turn on verbose mode
151 .B \-\-debug Turn on debug mode
153 .B \-\-version Print version
155 .B \-\-help Print a terse help message
158 Kevin Rosenberg, M.D. <kevin@rosenberg.net>
162 was first written in 1983 using MS-DOS and an EGA display adapter. In 1999 it was ported to GNU/Linux.
165 .BR ctsim (1), ifinfo (1), if1 (1), if2 (1), ifexport (1), phm2pj (1), phm2if (1), pj2if (1), pjinfo (1)