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NAME¶
pjrec - 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
AUTHORS¶
Kevin Rosenberg, M.D. <kevin@ctsim.org>
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.
