The idea of SRAD is to smear pixels in a homogeneous region and stop at object borders, thus preserving image edges while denoising the image.
Below: CP ultrasound of a 12 mm target at +6 dB from the background. Bottom is the scaled SRAD used in this study after 3300 iterations applied to an eREC-FC ultrasound image of the same target. Bottom shows the filter's effects on the CP image in an overlaid manner.
SRAD Results