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Figure 1 (A) The adventitia is defined as tissue outside the external elastic membrane contour. For all non-shadowed adventitia pixels, the mean value and standard deviation are calculated. To observe the suitability, a normal distribution curve based on the same mean and standard deviation histogram is created. (B) Cross-sectional image of echogenicity and distribution graph of plaque echogenicity behind the stent struts. Hyperechogenic areas are colored green. Hypoechogenic areas are colored red. ROI = region of interest.
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