1. A method for facilitating breast cancer screening, comprising: acquiring raw ultrasound images of breast slices representing sonographic properties of a breast; forming a volumetric representation of said sonographic properties from said raw ultrasound images of said slices; computing a two-dimensional thick-slice ultrasound image from said volumetric representation, said thick-slice ultrasound image representing said sonographic properties within a slab-like subvolume of the breast having a thickness greater than about 2 mm and less than about 20 mm; displaying said thick-slice ultrasound image to a user during a viewing session; computing a planar ultrasound image from said volumetric representation, said planar ultrasound image representing said sonographic properties along a substantially planar portion of the breast that is substantially nonparallel to said slab-like volume; and electronically displaying said planar ultrasound image to the user during the viewing session.