Filters in 2D and 3D Cardiac SPECT Image Processing

Figure 1

The effect of varying cutoff frequencies of Butterworth filter of order 5 (power factor = 10 for all critical frequencies) with FBP. First column shows myocardial slices and second column shows Butterworth equation curves for various cutoff frequencies (0.2, 0.3, 0.5, and 0.8) in cycles/cm (minimum value 0.0 and maximum value 2.0).