1. A method for determining a candidate lesion region in a digital ultrasound medical image of anatomical tissue, the method comprising using a processor or computer to perform automatically steps of: accessing the digital ultrasound medical image of anatomical tissue; applying an anisotropic diffusion filter to the ultrasound image to generate a filtered ultrasound image; performing a normalized cut operation on the filtered ultrasound image to partition the filtered ultrasound image into a plurality of regions; merging the plurality of regions into merged regions based on predetermined threshold values; and selecting, from the merged regions, at least one region as a candidate lesion region.