Construction of ultrasonograms by spiral scan and three-dimensional display of a tissue.

概要

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Since a tissue has a volume, it should be characterized not only by qualitative but also by quantitative information. This paper discusses a three-dimensional (3D) display of a tissue, which is displayed together with the ultrasonogram of any specified crosssection. A 3D scanner and the imaging system have been developed so that they may yield spacially enough uniform 3D echo data of a tissue. A spiral scan is newly employed here by which a probe can be rotated in a spiral fashion. The spirally scanned echo data are stored in a disc and are easily accessible because of the easiness of the coordinate conversion. In this manner the corresponding echoes of any plane can be collected fast for the reconstruction of an ultrasonogram.The 3D image in this system consists of a number of contour images of cross sections which are overlayed with gradated intensities of gray-scale. The 3D technique is also used for a volume measurement. The specified-plane ultrasonogram, on the other hand, is displayed in pseudo colors and is again overlayed on the black and white 3D contour image. Using the two- and three-dimensional images, the positional relation between a plane and the total shape can be observed clearly, when the location of a crosssection is changed little by little.The system is currently applied to ophthalmic region and some experimental results are also reported.
一般社団法人日本生体医工学会の論文