Fig. 7
From: Establishment of a clinical SPECT/CT protocol for imaging of 161Tb
The Jaszczak phantom imaged with ELEGP (A/D/G), MEGP (B/E/H), and LEHR (C/F/I) collimators and reconstructed with A-OSEM (A/B/C), AS-OSEM (D/E/F), and ASC-OSEM (G/H/I), respectively, for EM2. A-OSEM and AS-OSEM images were postfiltered using a Butterworth filter of order 2 and cutoff frequency 0.08 cycles/mm. The color scale is normalized to each image separately