Slices corresponding to the plane y = 0 of the images reconstructed by use of the GPU-based implementations of (a) the PLS-Int algorithm from the “64 × 90”-data, (b) the PLS-Int algorithm from the “64 × 45”-data, (c) the PLS-Int algorithm from the “32 × 45”-data, (d) the PLS-Sph algorithm from the “64 × 90”-data, (e) the PLS-Sph algorithm from the “64 × 45”-data, and (f) the PLS-Sph algorithm from the “32 × 45”-data.