Fig. 3
From: Quantitative comparison of PET performance—Siemens Biograph mCT and mMR
Contrast vs background variability with increasing number of iterations (2–8, left to right) and with different reconstruction settings for the Biograph mCT and mMR system; 10-mm hot sphere, 1:8 ratio (a), 37-mm cold sphere, 1:8 ratio (b), 10-mm hot sphere, 1:4 ratio (c) and 37-mm cold sphere, 1:4 ratio (d)