Patent ID: 6426992
Filing Date: 2002-07-30
Classification: A61B,G01T,Y10S

Abstract:
A computed tomography apparatus which includesa scanning unit which includes a radiation source (S) and a detector unit (16) which is connected thereto in order to detect a conical radiation beam, emitted by the radiation source, after its passage through an examination zone (13) or an object present therein, a drive device (2, 5) for realizing a relative motion in the form of a helix, comprising a rotation about an axis of rotation (14) and a displacement parallel to the axis of rotation, between the scanning unit (S, 16) and the examination zone (13) or the object, the projection of the outer edges of the detector unit, being mutually offset in the axial direction, onto the helix including a path of (2n+1)p, where n is an integer >1 and p corresponds to the axial offset of two neighboring turns of the helix, and the detector unit including a plurality of detector segments that are spatially separated from one another and are mutually offset in the axial direction, each of said detector segments being arranged and shaped in such a manner that its projection onto the helix covers at least two neighboring turns of the helix.