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Figure 1 Plaque Characterization by VH IVUS

(A) A traditional grayscale intravascular ultrasound (IVUS) cross-sectional image of coronary plaque. (B) Corresponding image using virtual histology IVUS (VH IVUS), depicting different color-coded tissues based on spectral analysis of the radiofrequency ultrasound signals. The components are indicated by dark green for fibrotic tissue; light green for fibro-fatty tissue; red for necrotic core; white for dense calcium.