Fig. 4
From: Establishment of a clinical SPECT/CT protocol for imaging of 161Tb
Recovery (a–c), relative noise (d–f), and signal-to-noise ratio (g–i) as a function of hot sphere diameter for images reconstructed using EM1 data. The data for the LEHR, ELEGP, and MEGP collimators are in first column (a, d, g), second column (b, e, h), and third column (c, f, i), respectively. Observe that the data for A-OSEM and AS-OSEM is frequently undistinguishable