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Fig. 4A —Phantom with simulated vessels with 50% stenosis. Results
show low attenuation decreased contrast-to-noise ratio and caused
overestimation of stenosis, especially in small vessels. High attenuation
enhanced contrast-to-noise ratio but also caused severe partial volume effect.
Thus larger stenosis in larger vessel was clearly depicted but stenosis was
underestimated in smaller vessels. CT attenuation of 350 H is optimal for
accurate quantification of stenosis in larger and smaller vessels. CT scan
shows 3- and 5-mm coronary arteries under low-attenuation (200 H)
protocol.
