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SNR and TBR based on different size of lesions: diameter < 10 mm (A,D), 10 mm ≤ diameter < 20 mm (B,E), diameter ≥ 20 mm (C,F). The quartiles are represented by the bottom and top line, respectively. Median is middle line. SNR, signal-to-noise ratio; TBR, tumor-to-background ratio.
