Volume visualization, which expresses interactively and three-dimensionally invisible inter- nal structure or information of existing object or phenomenon, has lately attracted consider- able attention as new visualization technology. In this field, it is essential and very important subject that reconstruct three-dimensional volume data of a high precision from sampling or measuring data of object. In this paper, we propose an algorithm that does not reconstruct the slice image set but directly reconstruct three-dimensional volume data from small set of multi-view X-ray projection images, on which image the shape-known object(s) is parallel projected from an arbitrarily decided direction.
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