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Computed tomography apparatus

  • US 4,641,328 A
  • Filed: 07/21/1983
  • Issued: 02/03/1987
  • Est. Priority Date: 07/21/1982
  • Status: Expired due to Fees
First Claim
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1. A computed tomography apparatus for reconstructing cross-sectional images of a body to be examined corresponding to selected cardiac phases of the cardiac cycle, comprising:

  • means for directing a divergent beam of penetrating radiation through the body;

    means for effecting relative angular displacement between the divergent beam of penetrating radiation and the body irrespective of the cardiac cycle of the body;

    means for detecting the penetrating radiation that passes through the body at a number of angular positions of the divergent beam relative to the body during said relative angular displacement to derive sets of detected radiation measurements representative of attenuation of the penetrating radiation by the body;

    display means including a cathode ray tube having a display screen;

    ECG detector means for generating electrocardiogram signals, during said relative angular displacement, corresponding to electrical signals of the heart created during each cardiac cycle;

    means for storing the radiation measurements detected by said detecting means, together with data corresponding to the electrocardiogram signals generated from said ECG detector means said electrocardiogram data being associated with said radiation measurements when such data is acquired in that said radiation measurements are correlated with the various cardiac phases of the cardiac cycles represented in such data;

    sequence control means for selecting specific phases of the cardiac cycle during which cross-sectional images of the examined body will be reconstructed and displayed;

    means for reconstructing the cross-sectional images of the body corresponding to the selected cardiac phases and said detected radiation measurements associated therewith and including display interface means for providing video signals corresponding to said cross-sectional images on said display screen of the cathode ray tube; and

    means for providing on said display screen an electrocardiogram display corresponding to the stored electrocardiogram data in said storing means upon the selection of a specific cardiac phase by said sequence control means.

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