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Fig. 1B. —Graphs show diagnostic confidence per observer and imaging technique. Each numbered line represents mean confidence score of single observer using each technique for cases with negative (A) and positive (B) findings for appendicitis. Optimal score would be 0 for cases with negative findings and 10 for cases with positive findings. FACT = focused appendiceal CT, A/P CT = abdominopelvic CT. "Enhanced" indicates use of colonic contrast material.

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