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Classification of tissue coverage of stent struts. The left images (A, B) show uncovered struts and the right images (C, D) show covered struts. A strut with surrounding tissue beyond the strut surface is defined as covered. According to the shape of the tissue covering the struts, a covered strut is classified as convex (C) or embedded (D). The intimal thickness (NIT) was measured from the surface of the neointima covering the strut to the center line of the reflection.
