Fig. 4From: Optimal clinical protocols for total-body 18F-FDG PET/CT examination under different activity administration plansRelationship between the objective indicator (CNR) and the subjective assessment (5-point Likert scale). A The reference example images of grades 1–5 in the 5-point Likert scale (L1: poor, L5: excellent). B Scatter plot for the CNR value vs. 5-point Likert scale upon the total body PET/CT scanner and the conventional short AFOV PET/CT scanner (derived from Siemens Biograph mCT scanner in this study), respectively. The 5-point Likert scale was independently rated by two nuclear radiologists in blindBack to article page