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Figure 3 Images of the lesion not causing acute coronary syndrome. (A) Angiography of the left coronary artery. (Upper) The arrowhead indicates a lesion, in which intravascular ultrasound (IVUS) measurements were recorded at baseline. (Lower) the arrowhead indicates the segment indicated by the arrowhead at baseline after the follow-up period. (B) Conventional 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 small lipid core (blue) with large fibrous tissue (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 small lipid core (blue) with large fibrous tissue (red or white). CL = calcification. Bar = 1 mm.