Interactive Segmentation of 3D Medical Images with Subvoxel Accuracy

There is disclosed a countercurrent system, for instance for removing particles, such as fish solids, citrus pulp and other dust particles or syrupy droplets, from the exhaust gases from a dryer or the like. The system includes a vessel provided with coaxially interdigitated upper and lower baffles which control a countercurrent flow of the washing liquid and gas stream. The baffles are of graduating heights and the upper set "floats" at a level determined by the pressure within the vessel. The washing liquid with entrained gas assists in cleansing the baffles. Cleaning ports may also be provided.