Method for evaluating projection datasets of an object undergoing examination

摘要

An object (5) undergoing examination is located within the range of a swiveling axis (4) around which an X-ray source (1) is swiveled during a plurality of mutually discrete swiveling actions. An X-ray detector (2) is swiveled correspondingly so that it will at any time be located diametrically opposite the X-ray source (1) with reference to the swiveling axis (4). Projection datasets (P) of the object (5) undergoing examination are recorded at swiveling angles (α) of the X-ray source (1) during the swiveling actions and stored. Each projection dataset (P) is assigned the respective swiveling angle (α) and a recording instant (t). Together with the swiveling angle (α) assigned to the respective projection dataset (P), each data element of each projection dataset (P) defines a projection line along which an X-ray beam has traveled on its way from the X-ray source (1) to the X-ray detector (2). The projection datasets (P) form recording groups each of which corresponds with the projection datasets (P) that were recorded during a single swiveling action. A computer (15) determines at least one reconstruction group of reconstruction datasets using the projection datasets (P). Each reconstruction dataset contains at least one reconstruction data value assigned to a reconstruction line. Using a temporal interpolation, the computer (15) determines the reconstruction group's reconstruction datasets in such a way that they refer to a uniform reconstruction time. The computer (15) determines a reconstruction of the object (5) undergoing examination using the reconstruction group's reconstruction datasets.