pjrec(1)
reconstruction from projections
SYNOPSIS
pjrec projection-file image-file nx-image ny-image [OPTIONS]
DESCRIPTION
pjrec takes projection data from raysum-fileP and produces an
(IF) image file image-file, of size nx-image by
ny-image pixels, containing the reconstructed image.
OPTIONS
pjrec accepts the following options, which control the
reconstruction algorithm:
- --interp
-
Interpolation method during backprojection
-
- nearest
-
Nearest neighbor interpolation
- linear
-
Linear interpolation
- --preinterpolate
-
Preinterpolation factor (default = 1). Used only with frequency-based
filtering
- --filter
-
Filter name
-
- abs_bandlimit
-
Abs * Bandlimiting (default)
- abs_sinc
-
Abs * Sinc
- abs_cosine
-
Abs * Cosine
- abs_hamming
-
Abs * Hamming
- shepp
-
Shepp-Logan
- bandlimit
-
Bandlimiting
- sinc
-
Sinc
- cosine
-
Cosine
- triangle
-
Triangle
- hamming
-
Hamming
- --filter-method
-
Filter method before backprojections
-
- convolution
-
Spatial filtering (default)
- fourier
-
Frequency filtering with discete fourier
- fourier_table
-
Frequency filtering with table lookup fourier
- fft
-
Fast Fourier Transform
- --zeropad n
-
Set zeropad level (default = 0). set n to number of powers to two to pad
- --filter-generation
-
Filter Generation mode
-
- direct
-
Use direct filter in spatial or frequency domain (default)
- inverse_fourier
-
Use inverse fourier transform of inverse filter
- --backproj
-
Backprojection Method
-
- trig
-
Trigometric functions at every point
- table
-
Trigometric functions with precalculated table
- diff
-
Difference method
- diff2
-
Optimized difference method (default)
- idiff2
-
Optimized difference method with integer math
- idiff3
-
Highly-optimized difference method with integer math
- --filter-param
-
Alpha level for Hamming filter
- --trace
-
Set tracing to level:
-
- none
-
No tracing (default)
- console
-
Text level tracing
- --verbose Turn on verbose mode
-
- --debug Turn on debug mode
-
- --version Print version
-
- --help Print a terse help message
-
HISTORY
CTSim was begun in 1983 using MS-DOS and an EGA display adapter. In
1999 it was ported to GNU/Linux and later ported to Microsoft Windows.
