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Figure 1 Corresponding Images of OCT and Coronary Angioscopy

In the angioscopic images, plaque color was graded as white (A-1), light yellow (B-1), yellow (C-1), or intensive yellow (D-1). A lipid pool (*) was characterized by a signal-poor region, and it was semiquantified as the number of involved quadrants on the cross-sectional optical coherence tomography (OCT) image (A-2, B-2, C-2, D-2). The fibrous cap was identified as a signal-rich region between the coronary artery lumen and inner border of lipid pool in the OCT image, and its thickness was measured at the thinnest part (A-3, B-3, C-3, D-3; arrows).