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Image rating for ultrasound and CT images of patients with abscess cavities. Figure 4 compares the average (95% confidence interval) rating for ultrasound and CT images of patients with a superficial abscess cavity. Images were rated on the following numeric scale from 1 to 4 based on image details with 1 corresponding to changes in the soft tissue but no abscess cavity visualized and 4 corresponding to fine details of the abscess cavity contents visualized.
