A system and method for ulcer detection which may generate a vector of grades including grades indicative of a probability that the image includes an ulcer, for example an ulcer of specific type. The user interface includes a touch screen and a controller coupled to the touch screen. The corrugated second part of the fin is formed with a plurality of second louvers each extending substantially between the two second heat exchanger tubes. Weights are determined for the available paths as a decreasing function of cost of the corresponding path, state information of the present node and received state information of one or more nodes at the corresponding path. In the method of the invention, an analog signal is converted to a digital value using the analog-to-digital converter, and a pair of digital-to-analog converters each generate, via successive approximation, a differential feedback analog signal that is applied to a differential comparator for comparison to the input analog signal being digitized.