Computed tomography apparatus with image production using fourier reconstruction
AssigneeSiemens Akiengesellschaft
InventorsJuergen Wohlrab, Manfred Herbert
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Abstract
A computed tomography apparatus which generates an image of an examined subject using Fourier reconstruction with a gridding algorithm operates so that this algorithm is efficiently implemented by employing a hardware unit in the form of an ASIC, which produces the additional formation of contributions in the Cartesian frequency matrix, derived from the polar support points.
Claims4
A computed tomography apparatus comprising an X-ray source which emits an X-ray fan beam, a radiation detector on which said fan beam is incident after penetrating a subject and which emits measurement data corresponding to said fan beam attenuated by said subject, means for rotating said X-ray source and said radiation detector around said subject to obtain measurement data from a plurality of different angular projections, computer means for reconstructing an image from the measurement data according to a Fourier reconstruction method, and an ASIC in said computer means having computational means for processing a gridding algorithm for forming additional contributions in a Cartesian frequency matrix derived from polar support points.
A computed tomography apparatus comprising an X-ray source which emits an X-ray fan beam, a radiation detector on which said fan beam is incident after penetrating a subject and which emits measurement data corresponding to said fan beam attenuated by said subject, means for rotating said X-ray source and said radiation detector around said subject to obtain measurement data from a plurality of different angular projections, and computer mean for reconstructing an image from the measurement data according to a Fourier reconstruction method, said computer means including computational means having a parallel arrangement of a plurality of ASICs with respectively associated memories, for means of partitioning of polar support points to the ASICs, forming additional contributions in a Cartesian frequency matrix, derived from the polar support points, accelerated by parallel processing.
Dependencies are inferred from the claim text.