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Fig. 5C —Phantom with simulated vessels with 25% stenosis. Results
show low attenuation decreased contrast-to-noise ratio and thus caused
overestimation of stenosis, especially in small vessels. High attenuation
enhanced contrast-to-noise ratio but also caused severe partial volume effect
on small stenosis, especially in small vessels. Intracoronary CT attenuation
of 350 H was optimal for accurate quantification of coronary stenosis for
larger and smaller vessels. CT scan shows 3- and 5-mm coronary arteries under
high-attenuation (500 H) protocol.
