Pairs of unmatched projection matrices, in MATLAB sparse matrix format.

This repository contains mat-files with test matrices in MATLAB sparse matris format. The matrices are generated by means of the ASTRA Toolbox software using GPU acceleration. Each mat-file contains the following variables:

• A - a sparse matrix that represents the forward projector in X-ray CT
• B - a sparse matrix that represents the back projector; note that B is not equal to the transpose of A
• GPU - a logical scalar that is true, indicating that A and B were generated on a CUDA GPU
• m - the number of rows in A (and the number of columns in B)
• n - the number of columns in A (and the number of rows in B)
• num_angles - the number of projection angles in the X-ray measurement setup
• num_detectors - the number of detectors in the X-ray measurement setup
• num_pixels - image size; the square image to be reconstructed ix num_pixels x num_pixels

At this time we provide a small and a large test problem