We now turn our attention to testing the SD2I architecture on real experimental synchrotron X-ray tomography data. We obtain a 'ground truth' reconstruction in this case by reconstructing the images using CGLS with the full projection set. We then decrease the projection set to ¼ of the original size and compare the results of the reconstruction using CGLS, FBP, SART, SIRT and SD2I on the decreased sinogram.