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Fig. 2 —Balloon filled with contrast medium simulates beating heart
and simulated vessels during stenosis detection in cardiac phantom. A,
Whole axial CT image shows placement of regions of interest. Four small
objects attached to balloon are four acrylic tubes simulating coronary
arteries. Circles indicate simulated vessels with stenosis. B, CT image
with observer input shows selection of region of interest for 5-mm
vessel.C, CT image shows segmentation whereby plaque used to simulate
stenosis and contrast-filled lumen are separated from vessel wall and from
each other.
