| 摘要 |
In an X-ray CT (computerized tomographic) imaging method, scano data is produced from X-ray projection image data about a helically-scanned biological body under medical examination. The X-ray projection image data are acquired only at a predetermined projection angle such as 0 DEG during a helical scanning operation. Accordingly, no X-ray projection to acquire the scano data is required to reduce X-ray dose given to the biological body. The X-ray CT imaging method comprises the steps of: scanning a biological body under medical examination in a helical scanning mode, while relatively rotating an X-ray tube and an X-ray detector 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 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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