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Computer tomograph having means for displaying shadowgraphs

  • US 5,315,628 A
  • Filed: 06/09/1993
  • Issued: 05/24/1994
  • Est. Priority Date: 06/24/1992
  • Status: Expired due to Term
First Claim
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1. A medical imaging apparatus comprising:

  • measurement means for conducting a scan of an examination subject, said measurement means including an x-ray source and a radiation detector rotatable around said examination subject for irradiating said examination subject with an x-ray beam from said x-ray source at at least one projection angle, said radiation detector generating electrical output signals corresponding to radiation incident thereon at each projection angle;

    means for effecting relative longitudinal displacement between said measurement means and said examination subject;

    means for calculating a shadowgraph of said examination subject in real time as said relative longitudinal displacement takes place, from output signals with said measurement means disposed at a selected projection angle a plurality of times during said scan; and

    means for displaying said shadowgraph, as said shadowgraph is calculated, to an extent correlated with the amount of relative longitudinal displacement between said examination subject and said measurement means.

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