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Figure 2 Images of the culprit lesion causing acute coronary syndrome. (A) Angiography of the circumflex coronary artery. (Upper) The arrowhead indicates a lesion, in which IVUS measurements were recorded at baseline. (Lower) The arrowhead indicates the culprit lesion at follow-up. (B) Conventional intravascular ultrasound (IVUS) image of the segment indicated by the arrowhead in A. (C) Integrated backscatter (IB)-IVUS image of Cartesian coordinates, constructed using conventional color gradation, of the segment indicated by the arrowhead in A. The asterisk indicates the guidewire artifact. Note the large lipid core (blue) with fibrous cap (green). (D) IB-IVUS image of Cartesian coordinates, constructed using another color gradation, of the segment indicated by the arrowhead in A. The asterisk indicates the guidewire artifact. Note the large lipid core (blue) with fibrous cap (red or white). CL = calcification. Bar = 1 mm.
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