In contrast, AFT weighs any obtained angle identically and uses only simple masking to determine which regions to include in the analysis . Once the angular features have been extracted using RFT, similar orientation angles can be grouped enabling RFT to discard angles that have low amplitudes. The filtering threshold can be adjusted by removing all angles, except the ones with the highest amplitudes, by default. Grouping then allows the identification of areas with similar angles, as seen in the MRI image (Fig. ) at the bottom half and top half.