Patent ID: 6379041
Filing Date: 2002-04-30
Classification: A61B

Abstract:
An X-ray apparatus comprising:an X-ray examination system having an X-ray source which emits an X-ray beam from a focus and an X-ray detector on which said X-ray beam is incident; means for displacing said X-ray examination system relative to an examination subject while irradiating said examination subject with said X-ray beam from a plurality of different projection angles for obtaining a plurality of 2D projection images of said examination subject respectively at said plurality of different projection angles, each of said 2D projection images having a unique projection geometry associated therewith; means for determining extrinsic imaging parameters and means for determining intrinsic imaging parameters for each of said 2D projection images, for determining the respective projection geometries for said 2D projection images, said means for determining intrinsic imaging parameters comprising a plurality of X-ray positive marks disposed in a path of said X-ray beam, said X-ray positive marks following displacement of said X-ray examination system; and a computer using said 2D projection images and said projection geometries for constructing a 3D image therefrom of said examination subject.