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Fig. 3A —Accuracy of measured percentage stenosis. Values are means;
error bars indicate mean ± 0.5 SD; light gray, 3-mm vessel diameter;
dark gray, 5-mm vessel diameter. Graph shows effects of attenuation protocols
of cardiac CT angiography (CTA) on accuracy of detection of 25% stenosis
detection. High-attenuation (500 H) protocol resulted in underestimation of
stenosis. Stenosis was especially difficult to detect in smaller vessels.
Low-attenuation (200 H) protocol led to overestimation of stenosis detection
within clinically acceptable limits, but imaging quality was much less
reproducible than in other protocols.
