Filtering in SPECT Image Reconstruction

Figure 3

Butterworth smoothing filter six curves by different 𝑓_𝑐 and 𝑛 parameters (equation (2)). A, B, C curves created by critical frequency 𝑓_𝑐=0.1 c/pixel and order 𝑛 equal to 2, 8, 32 correspondingly. D, E, F curves created by critical frequency 𝑓_𝑐=0.3 c/pixel and order 𝑛 equal to 2, 8, 32 similarly [6].