pSnakes: A new radial active contour model and its application in the segmentation of the left ventricle from echocardiographic images. - Auzuir Ripardo de Alexandria; Paulo César Cortez; Jessyca Almeida Bessa; John Hebert da Silva Felix; José Sebastião de Abreu; Victor Hugo C. de Albuquerque (Comput. Methods Programs Biomed., 2014)