Automatic Characterization of the Physiological Condition of the Carotid Artery in 2D Ultrasound Image Sequences Using Spatiotemporal and Spatiospectral 2D Maps

Figure 15

The plots in the left column (a1, b1, c1, and d1) show four spectral curves, each of which is the average of the columns of the spatiospectral 2D map corresponding to one of the four cases presented in Figure 14. The right column shows four plots (a2, b2, c2, and d2), denoted as FT² curves, each of which presents the result of applying the Fourier transform to the corresponding spectral curve in the left column. Normalized sums of the areas under each spectral curve and each FT² curve are also presented.