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Figure 3 In vivo intravascular ultrasound image and palpogram of a human coronary artery. The elastogram reveals that the plaque has soft edges with adjacent hard (calcified) tissue. Plaque deformability was scored according to the Rotterdam classification (ROC), in which ROC I and IV indicate low (0% to 0.6%) and very high (>1.2%) deformation, respectively, by strain.