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Example annotations for IVOCT images in (x, y) (a) and (r, θ) (b) views. The left and right columns show IVOCT images and expert annotations, respectively, with labels (M: lumen, L: lipid, C: calcium, and O: other). Because lipids are highly absorbing, we do not know their actual depth and assigned this class a consistent thickness of 350 μm. Here and in other figures, IVOCT images are shown following log transformation for improved visualization.
