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A straightforward technique for sub-segmentation of the human colon has been described. Using this technique it is possible to automatically identify each of the individual colonic regions. Sub-segmentation can be used in conjunction with CAD, thus facilitating automated reporting at computed tomography colonography (CTC). The sub-segmentation technique described in this paper has been evaluated using real patient data. In each case the colon lumen was accurately sub-segmented even in the presence of significant colonic distortions. The research described in this paper is an extension of our work in the area of colon centreline calculation (Sadleir, R.J.T., Whelan, P., 2002, "Colon centreline calculation for CT colonography using optimised 3D topological thinning", in Proc. 1st International Symposium on 3D Data Processing Visualization and Transmission, 800-803). Subsegmentation is a good example of how the colon centreline can be analysed in order to obtain additional information about the structure of the colon, thus enhancing the CTC process. (5 pages)

A novel technique for identifying the individual regions of the human colon at CT colonography