Abstract
AbstractA support system for hepatectomies enabling quantitative analyses of three‐dimensional distances between parts or volumes of parts in an operation area to facilitate intuitive understanding of the locational relationships and three‐dimensional structures inside and outside the operated area has been developed. First, imaging and measuring of the three‐dimensional internal structures of the operation area have been performed using ultrasound measuring equipment. A three‐dimensional sensor is installed on the ultrasonic wave probe to obtain three‐dimensional locational information of tomographic images. The tomographic images are rearranged three‐dimensionally in the data space, sampling is performed three‐dimensionally, and three‐dimensional images are reconstructed as voxel data. In addition, the three‐dimensional shape of the operating area surface is image‐measured and three‐dimensional images are reconstructed as polygon data. Three‐dimensional images of the internal structures and three‐dimensional images of the surface shape are collocated three‐dimensionally by superposing the coordinate systems of the two systems on the data space three‐dimensionally, using measurement data of the two measurement systems with respect to established reference points. The internal structures are displayed three‐dimensionally using the volume rendering method and the surface shape is three‐dimensionally displayed by being superimposed on the image plane using the surface rendering method, so that the internal structures and the surface shape of the operated area can be simultaneously observed intuitively as well as quantitatively. Experimental results obtained by this system, using agar phantoms and isolated pig liver, are presented. © 2002 Wiley Periodicals, Inc. Syst Comp Jpn, 33(6): 73–82, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/scj.1134
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