Analytic image reconstruction: ssrb_fbp

This program applies a SSRB-FBP2D 22 method to reconstruct PET images. First, a Single Slice rebinning algorithm (SSRB converts 3-dimensional projection data in a set of 2-dimensional sinograms, one per each axial image slice; next, a Filtered Back Projection (image reconstruction algorithm that makes use of the Radon transform 23 ) is performed in each slice.

As input data, the program requires the name of the GAMOS projection data file without extension (.hv/.v). These files can be generated by GAMOS (see "PET output for reconstruction" section) or converted from list-mode files using the lm2pd utility. The command-line options are the following:

The following example will apply a SSRB-FBP2D reconstruction to a projection data file named "MY_PROJDATA_ALL.hv" using a Butterworth filter of order=6 and cutoff frequency=0.5 Nyquist units, image and pixel sizes take values from the projection data (tangential bins):


      ssrb_fbp MY_PROJDATA_ALL -f 2 -b 6 -c 0.5 -n MY_IMAGE
    

To use this utility, you have to install the FFTW library at the path where the variable FFTW_BASE_DIR points (type echo $FFTW_BASE_DIR. You can download this library at http://www.fftw.org