Fig. 4From: Improved PET/MRI accuracy by use of static transmission source in empirically derived hardware attenuation correctionRPD of NAC, TX-based AC, and CT-based AC PET images for the acrylic cylinder, posterior array, and patient table are shown in a, c and e, respectively, compared to blank. Distribution of photon counts are displayed in histograms in b, d, and f comparing TX-based AC to CT-based AC and blankBack to article page