Patent Document ID: 20070280523
Application ID: 11571905
Patent Flag: 0

Claim One:
1. A computed tomography method with the following steps: a) Production of a cone-shaped bundle of rays which passes through an examination zone and an object located therein, using a radiation source, b) Production of a relative movement between the radiation source on the one hand and the examination zone on the other hand, which comprises a rotation around a rotational axis and a displacement parallel to the rotational axis, and which has the form of a helix, c) Acquisition of real measured values which depend on the intensity in the bundle of rays on the other side of the examination zone, using a detector unit, d) Determination of non-acquired, fictitious measured values from the real measured values, wherein assigned to each fictitious measured value is a fictitious beam which is emitted from a fictitious radiation source position, and wherein the determination of a fictitious measured value has the following steps: Determination of an intersection point of the helix with an ortho straight line that stands orthogonally on the helix and runs through the fictitious radiation source position, Determination of an intersection ellipse between a fictitious cylindrical surface, on which the helix is arranged, and an ellipse plane that is defined by the tangent vector of the helix at the intersection point and by a vector that is oriented perpendicular to the rotational axis and starts from the intersection point, Determination of the fictitious measured value from the real measured values by solving John's equation for a movement of the radiation source relative to the examination zone along the intersection ellipse, e) Reconstruction of an object image from the real measured values and the fictitious measured values.