problems of the modern medical image processing. A number of popular codes for US
segmentation are based on a generalized gradient vector flow (GGVF) method proposed by
Xu and Prince. The GGVF equations include a smoothing term (diffusion) applied to regions
of small gradients of the edge map and a stopping term to fix and extend large gradients
appearing at the boundary of the object. The paper proposes two new directions. The first …