1. A medical imaging system comprising: an ultrasound imaging device; and a computer-usable medium, electrically coupled to the ultrasound imaging device, having a sequence of instructions which, when executed by a processor, causes said processor to execute a process including generating an ultrasound image, comprising a plurality of pixels, from signals received by the ultrasound imaging device, deconvolving the ultrasound image, wherein the deconvolved ultrasound image includes a plurality of regions of pixels, evaluating the regions of pixels of the deconvolved ultrasound image by calculating a mean brightness and a standard deviation from the mean brightness for each region of pixels and plotting each region on a graph of mean brightness versus standard deviation from mean brightness, and assigning each region of pixels into one of a plurality of pre-defined categories based at least in part on a mean brightness of the pixels in the region using the graph.