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Fig. 1B. —Contrast-enhanced helical CT scans of four different patients for which each observer interpreted vascular enhancement of ascending aorta, descending aorta, and pulmonary arteries to be identical using the following 4-point scale: 1, poor; 2, fair; 3, good; and 4, excellent. 35-year-old man with lymphoma. Observers scored vascular enhancement as 2.