1. A method for processing a plurality of two-dimensional (2D) image slices of a three-dimensional (3D) volume comprising, for each of the plurality of 2D image slices: (a) selecting a 2D image slice from the plurality of 2D image slices using a digital data processing system for image processing; (b) computing a histogram for the 2D image slice; (c) comparing the histogram with an anatomic atlas of average histograms including computing a correlation between the histogram and the anatomic atlas of average histograms; (d) assigning the 2D image slice to a volumetric region of the 3D volume based on the comparison; (e) performing segmentation on the 2D image slice to identify one or more connected components; and (f) labeling one or more pixels of one or more connected components on the 2D image slice using the digital data processing system.