Figure 10
From: Small-window parametric imaging based on information entropy for ultrasound tissue characterization

(a–e) B-mode images of the Type-D breast phantom with a mass at frequencies of 5, 5.5, 6, 7.5, and 8 MHz (SL = 1; scanned at a focus of 2 cm). (f–j) Entropy images corresponding to (a–e). (k–l) B-mode and entropy images scanned using 6 MHz and a focal length of 3 cm. The dimensions for all images are the same. The grayscale and color bars represent the pixel values (the brightness) of the B-mode and entropy images, respectively. (m) Entropy of the mass as a function of different settings (the “*” symbol indicates a p value < 0.05). Data were expressed by mean ± standard deviation.