3D liver surface images. (a) Liver and spleen fragment caused by accident. Images reconstructed by FBP, prefiltered by Hanning (critical value 0.8 cm−1) and ramp filter. (b) Haemangioma of liver. Images reconstructed by FBP, prefiltered by Butterworth (cut off 0.5 cm−1, power factor = 10) and ramp filter. (Studies offered by Radiation Physics Unit, Department of Radiology, University of Athens).
