pjrec(1)
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.