Coronal slices of renal SPECT study. The effect of filtering in smoothing and contrast of SPECT reconstruction, by FBP and Chang attenuation correction (coefficient 0.11) or OSEM iterations is reflected on clinical images. (a) FBP reconstruction, Butterworth filter (critical frequency 0.5 cm−1, power 10) (b) FBP reconstruction, Hann filter (critical frequency 0.9 cm−1) (c) OSEM 10 subsets/10 iterations (d) OSEM 10 subsets/10 iterations and postfiltering by Butterworth (critical frequency 0.5 cm−1, power 10). Study has been completed in Radiation Physics Unit, Department of Radiology, University of Athens.
