X-ray computerized tomographic imaging method and imaging system capable of forming scanogram data from helically scanned data
First Claim
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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Abstract
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° 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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Citations
26 Claims
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1. An X-ray CT (computerized tomographic) imaging method comprising the steps of:
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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. - View Dependent Claims (2, 3, 4)
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5. An X-ray CT (computerized tomographic) imaging method comprising the steps of:
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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 first and second projection angles from the entire X-ray projection image data obtained at the helical-scanning step; processing said selected X-ray projection image data to produce first and second scanograms 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 first and second scanograms and said X-ray CT image are substantially simultaneously displayed. - View Dependent Claims (6)
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7. An X-ray CT (computerized tomographic) imaging method comprising the steps of:
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scanning a first portion of a biological body under medical examination by continuously projecting an X-ray beam to the first portion 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 first X-ray projection image data about the helically-scanned first portion of the biological body by means of an X-ray detector; scanning a second portion of said biological body under medical examination by intermittently projecting an X-ray beam to the second portion of the biological body at a predetermined projection angle from the X-ray tube, to acquire second X-ray projection image data about the scanned second portion of the biological body; processing said second X-ray projection image data to produce a scanogram of said scanned second portion of the biological body by selecting only X-ray projection image data acquired at a predetermined projection angle from the entire X-ray projection image data; and reconstructing an X-ray CT image of said helically-scanned biological body based upon said first X-ray projection image data, whereby both of said scanogram and said X-ray CT image are substantially simultaneously displayed. - View Dependent Claims (8, 9, 10, 11)
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12. An X-ray CT (computerized tomographic) imaging system comprising:
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scanning means including an X-ray source and an X-ray detector, for scanning a biological body under medical examination in a helical scanning mode, while relatively rotating said 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; scano data processing means for selecting only X-ray projection image data acquired by said X-ray detector at a predetermined projection angle from the entire X-ray projection image data, and for processing said selected X-ray projection image data to produce a scanogram of said helically-scanned biological body by selecting only X-ray projection image data acquired at a predetermined projection angle from the entire X-ray projection image data; CT image reconstructing means for reconstructing an X-ray CT image of said helically-scanned biological body based upon said entire X-ray projection image data; and display means for substantially simultaneously displaying both of said scanogram and said X-ray CT image. - View Dependent Claims (13, 14, 15, 16)
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17. An X-ray CT imaging system comprising:
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scanning means including an X-ray source and an X-ray detector, for scanning a biological body under medical examination in a helical scanning mode, while relatively rotating said 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 by means of said X-ray detector; scano data processing means for selecting only X-ray projection image data acquired at first and second projection angles from the entire X-ray projection image data obtained from said scanning means, and for processing said selected X-ray projection image data to produce first and second scanograms of said helically-scanned biological body; CT image reconstructing means for reconstructing an X-ray CT image of said helically-scanned biological body based upon said entire X-ray projection image data; and display means for substantially simultaneously displaying both of said first and second scanograms and said X-ray CT image. - View Dependent Claims (18, 19, 20, 21)
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22. An X-ray CT imaging system comprising:
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scanning means including an X-ray source and an X-ray detector, for continuously scanning a first portion of a biological body under medical examination in a helical scanning mode, while relatively rotating said X-ray source around the biological body translated along a longitudinal axis of the biological body, to acquire first X-ray projection image data about the helically-scanned first portion of the biological body by said X-ray detector, and also for scanning a second portion of said biological body by intermittently projecting an X-ray beam of said X-ray source to the second portion of the biological body, to acquire second X-ray projection image data about the scanned second portion of the biological body; scano data processing means for processing said second X-ray projection image data to produce a scanogram of said scanned second portion of the biological body by selecting only X-ray projection image data acquired at a predetermined projection angle from the entire X-ray projection image data; CT image reconstructing means for reconstructing an X-ray CT image of said helically-scanned biological body based upon said entire X-ray projection image data; and display means for substantially simultaneously displaying both of said scanogram and said X-ray CT image. - View Dependent Claims (23, 24, 25, 26)
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Specification