Patent US4724387A successfully refreshed from Google Patents.
US4724387A
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Method and apparatus for high resolution nuclear magnetic resonance imaging
Assignee: Hitachi Healthcare Manufacturing Ltd
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Filing: 1985-10-28
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Granted: 1988-02-09
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Expires: 2005-10-28
Abstract
Abstract In a nuclear magnetic resonance imaging method and apparatus, the center position of each of a plurality of gradient magnetic fields are controlled to shift the positions of sampling points in a plurality of reconstructed images of the same part so that they do not overlap with each other in a sampling interval. As the result, the number of sampling points is effectively increased, thereby increasing the spacial resolving power of reconstructed images by NMR signals.
Inventors
- 👤 Koichi Sano
- 👤 Shimbu Yamagata
- 👤 Hideaki Koizumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:43
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/44; G01R33/48; G01R33/483; G01R33/4833; G01R33/54; G01R33/56
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
143 words
A nuclear magnetic resonance imaging method in which a static magnetic field, a plurality of gradient magnetic fields having different directions, and a high frequency magnetic field are applied to an object to be examined to detect a nuclear magnetic resonance signal from said object and to perform an operation of reconstruction of an image corresponding to said object on the basis of the detected signal, said method comprising: a step of shifting in an interlace manner the positions of sampling points on reconstructed images within a range smaller than a predetermined sampling interval by controlling independently the center positions of the respective gradient magnetic fields so that the sampling points do not overlap with each other; a step of producing cross-sectional images for the respective shifts of sampling points; and a step of combining said cross-sectional images for the image reconstruction operation.
Claim 2
Dependent Claim
143 words
A nuclear magnetic resonance imaging method in which a static magnetic field, a plurality of gradient magnetic fields having different directions, and a high frequency magnetic field are applied to an object to be examined to detect a nuclear magnetic resonance signal from said object and to perform an operation of reconstruction of an image corresponding to said object on the basis of the detected signal, said method comprising: a step of shifting in an interlace manner the positions of sampling points on reconstructed images within a range smaller than a predetermined sampling interval by controlling independently the center positions of the respective gradient magnetic fields so that the sampling points do not overlap with each other; a step of producing cross-sectional images for the respective shifts of sampling points; and a step of combining said cross-sectional images for the image reconstruction operation.
Claim 3
Dependent Claim
140 words
A nuclear magnetic resonance imaging apparatus comprising: magnetic field generating means for generating a static magnetic field, a plurality of gradient magnetic fields having different directions, and a high frequency magnetic field; detecting means for detecting a nuclear magnetic resonance signal from an object to be examined; operation processing means for performing an operation of reconstruction of an image corresponding to said object on the basis of the detected signal; and magnetic field controlling means for varying independently the center positions of the respective gradient magnetic fields to shift the positions of sampling points for reconstructed images within the range smaller than a predetermined sampling interval so that the sampling points do not overlap each other, said operation processing means combining a plurality of cross-sectional images produced for the respective shifts of sampling points to perform the image reconstruction operation.
Claim 4
Dependent Claim
140 words
A nuclear magnetic resonance imaging apparatus comprising: magnetic field generating means for generating a static magnetic field, a plurality of gradient magnetic fields having different directions, and a high frequency magnetic field; detecting means for detecting a nuclear magnetic resonance signal from an object to be examined; operation processing means for performing an operation of reconstruction of an image corresponding to said object on the basis of the detected signal; and magnetic field controlling means for varying independently the center positions of the respective gradient magnetic fields to shift the positions of sampling points for reconstructed images within the range smaller than a predetermined sampling interval so that the sampling points do not overlap each other, said operation processing means combining a plurality of cross-sectional images produced for the respective shifts of sampling points to perform the image reconstruction operation.
References Cited (Backward Citations)
US4587489A
Cited
US4593247A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-02-08 | 1991-08-10 | 1992-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-08 | 1995-08-10 | 1996-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-08 | 1999-08-10 | 2000-02-09 | $7700.00 | Window Closed / Lapsed |