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X-ray computerized tomographic imaging method and imaging system capable of forming scanogram data from helically scanned data

  • US 5,412,702 A
  • Filed: 09/11/1992
  • Issued: 05/02/1995
  • Est. Priority Date: 09/12/1991
  • Status: Expired due to Term
First Claim
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1. An X-ray CT (computerized tomographic) imaging method comprising the steps of:

  • scanning a biological body under medical examination in a helical scanning mode, while relatively rotating an X-ray source around the biological body translated along a longitudinal axis of the biological body, to acquire X-ray projection image data about the helically-scanned biological body;

    selecting only X-ray projection image data acquired by an X-ray detector at a predetermined projection angle from the entire X-ray projection image data obtained at the helical-scanning step;

    processing said selected X-ray projection image data to produce a scanogram of said helically-scanned biological body; and

    reconstructing an X-ray CT image of said helically-scanned biological body based upon said entire X-ray projection image data, whereby both of said scanogram and said X-ray CT image are substantially simultaneously displayed.

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