Figure 11: Figure showing a thin slice of filtered back-projection results by reconstructing a Shepp-Logan phantom. The 3D density was reconstructed from 180 equally spaced simulated projections using standard linearly interpolated FBP and using a Ram-Lak filter. It can be seen that the results from the FPGA + CPU solution have some errors; this is due to the fact that the 2D FFT of each projection is less accurate. The results are good enough to be used as a basis for further optimization based refinement methods.