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

AUTHORS

Kevin Rosenberg, M.D. <[email protected]>

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.