CT system for spirally scanning subject on a movable bed synchronized to X-ray tube revolution
First Claim
1. A computerized tomography system which includes an X-ray generator for producing X-rays, an X-ray detector array for detecting the X-rays transmitted through a subject, and a subject bed, said X-ray tube and said X-ray detectors being opposed to each other, X-ray beams being irradiated upo said subject in a sectorial manner at a large number of angles to scan said subject while said X-ray tube and said X-ray detectors are being revolved around said subject, said X-ray tube and said X-ray detectors remaining opposed to each other during the revolution, said system comprising:
- means for rapidly and continuously revolving a frame bearing said X ray tube;
means for moving said subject bed perpendicularly to a plane of revolution of said X-ray tube and for moving said subject bed synchronously with the revolution of said X-ray tube;
means for scanning said subject along with the movement of said subject bed in a spiral with respect to a coordinate system positioned about an imaginary axis passing through said subject; and
means for obtaining a reconstructed tomogram of an arbitrary cross-section within a range from a position corresponding to a beginning of the spiral scanning to a position corresponding to an end of the spiral scanning.
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Accused Products
Abstract
A computerized tomography system which includes an X-ray generator for producing X-rays, an X-ray detector array for detecting the X-rays transmitted through a subject, and a subject bed. The X-ray tube and the X-ray detectors are opposed to each other, and the X-ray beams are irradiated upon the subject in a sectorial manner at a large number of angles to scan the subject while the X-ray tube and the X-ray detectors are being revolved around the subject, the X-ray tube and X-ray detectors remaining opposed to each other the during revolution. The system includes a system for rapidly and continuously revolving a frame bearing the X-ray tube, a system for moving the subject bed perpendicularly to a plane of revolution of the X-ray tube and for moving the subject bed synchronously with the revolution of the X-ray tube, a system for scanning the subject along with the movement of the subject bed in a spiral with respect to a coordinate system positioned about an imaginary axis passing through the subject, and a system for obtaining a reconstructed tomogram of an arbitrary cross-section within a range from a position corresponding to a beginning of the spiral scanning to a position corresponding to an end of the spiral scanning. A method of operating the computerized tomography system is also provided.
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Citations
20 Claims
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1. A computerized tomography system which includes an X-ray generator for producing X-rays, an X-ray detector array for detecting the X-rays transmitted through a subject, and a subject bed, said X-ray tube and said X-ray detectors being opposed to each other, X-ray beams being irradiated upo said subject in a sectorial manner at a large number of angles to scan said subject while said X-ray tube and said X-ray detectors are being revolved around said subject, said X-ray tube and said X-ray detectors remaining opposed to each other during the revolution, said system comprising:
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means for rapidly and continuously revolving a frame bearing said X ray tube; means for moving said subject bed perpendicularly to a plane of revolution of said X-ray tube and for moving said subject bed synchronously with the revolution of said X-ray tube; means for scanning said subject along with the movement of said subject bed in a spiral with respect to a coordinate system positioned about an imaginary axis passing through said subject; and means for obtaining a reconstructed tomogram of an arbitrary cross-section within a range from a position corresponding to a beginning of the spiral scanning to a position corresponding to an end of the spiral scanning. - View Dependent Claims (2, 3, 4)
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- 5. A computerized tomography system comprising an X-ray tube for generating X-rays, X-ray detectors opposed to said X-ray tube to detect X-rays transmitted through a subject, a frame which is continuously rotated while bearing said X-ray tube and said X-ray detectors, a bed which is moved while bearing said subject, means for moving said bed perpendicularly to a plane of revolution of said X-ray tube and synchronously with said revolution, and means for irradiating X-rays upon said subject from said X-ray tube during the movement of said bed to spirally scan said subject.
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9. A computerized tomography system including an X-ray tube for generating X-rays, X-ray detectors opposed to said X-ray tube to detect X-rays transmitted through a subject, a frame which is continuously rotated while bearing said X-ray tube and said X-ray detectors, and a bed which is moved while bearing said subject, said system comprising:
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means for moving said bed perpendicularly to a plane of revolution of said X-ray tube and synchronously with said revolution; means for irradiating said X-ray upon said subject from said X-ray tube during movement of said bed to spirally scan said subject; buffer means for storing spiral data obtained by the means for irradiating said X-rays to spirally scan, said spiral data being stored in an address determined by a projection position number and a scanner rotation number; an interpolation circuit for performing interpolation on said spiral data to obtain projection data; and an inverse projection calculating circuit for subjecting said projection data to inverse projection to recompose a tomogram. - View Dependent Claims (10, 11, 12)
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13. A method of operating a computerized tomography system which includes an X-ray generator for producing X-rays, an X-ray detector array for detecting the X-rays transmitted through a subject, and a subject bed, said X-ray tube and said X-ray detectors being opposed to each other, X-ray beams being irradiated upon said subject in a sectorial manner at a large number of angles to scan said subject while said X-ray tube and said X-ray detactors are being revolved around said subject, said X-ray tube and said X-ray detectors remaining opposed to each other during the revolution, said method comprising the steps of:
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rapidly and continuously revolving a frame bearing said X-ray tube; moving said subject bed perpendicularly to a plane of revolution of said X-ray tube and moving said subject bed synchronously with the revolution of said X-ray tube; scanning said subject along with the movement of said subject bed in a spiral with respect to a coordinate system positioned about an imaginary axis passing through said subject; and obtaining a reconstructed tomogram of an arbitrary cross-section within a range from a position corresponding to a beginning of the spiral scanning to a position corresponding to an end of the spiral scanning. - View Dependent Claims (14, 15, 16)
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- 17. A method of operating a computerized tomography system including an X-ray tube for generating X-rays, X-ray detectors opposed to said X-ray tube to detect X-rays transmitted through a subject, a frame which is continuously rotated while bearing said X-ray tube and said X-ray detectors, a bed which is moved while bearing said subject, said method comprising the steps of moving said bed perpendicularly to a plane of revolution of said X-ray tube and synchronously with said revolution, and irradiating X-rays upon said subject from said X-ray tube during the movement of said bed to spirally scan said subject.
Specification