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Method for computed tomography of a periodically moving object to be examined, and a CT unit for carrying out this method

  • US 6,937,690 B2
  • Filed: 11/05/2003
  • Issued: 08/30/2005
  • Est. Priority Date: 11/05/2002
  • Status: Expired due to Fees
First Claim
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1. A method for producing CT images of a periodically moving area to be examined, comprising:

  • scanning the area to be examined with the aid of a beam, emanating from a focus, with a multiplicity of rays relating to a multiplicity of detector elements of a detector array, the focus and the detector array being relatively displaced and supplying data from which a change in attenuation of the rays between the focus and detector elements is determinable;

    collecting movement data from the periodically moving area to be examined, the detector data and data resulting therefrom being assignable to the movement states;

    using only output data, correlated with a specific movement state of the body region, to compose at least one CT image;

    dividing the output data, supplied during the movement of the focus on a spiral segment of sufficient length for reconstructing a CT image and assigned to specific movement states, into output data with reference to Nseg subsegments, reconstructing segment images by back projection and filtering, referred to movement state, with an image plane inclined to the system axis;

    combining segment images belonging to a subsegment and correlated with a movement state to form a component image, referred to movement state, with reference to a target image plane; and

    combining component images, referred to movement state, for at least one target image plane to form resulting at least one CT image of a specific movement state.

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