Phase- and GVF-Based Level Set Segmentation of Ultrasonic Breast Tumors

Figure 4

Comparison between original GVF field (Niter = 10) and improved GVF (Niter = 10) of the breast US image. (b) and (c) are zoomed-in views of the original GVF and improved GVF in square window marked in (a). As shown by the arrows, more gradient vectors in the improved GVF field point to the true boundaries.

(a)

(b)

(c)