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Figure 4 Figures of the phantom simulating the human coronary artery and thin-cap fibroatheroma targets. The near-infrared spectroscopy catheter was placed in the blood-filled lumen of the phantom and then rotated and pulled back in a test of detection of the spatially resolved targets. The bottom panel shows the results of the scan, with distance along the lumen on the x-axis and arc of rotation on the y-axis. As indicated by the yellow signal, the scan successfully detected all eight targets.