US5027070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
MR imaging system and method
Assignee: Hitachi Healthcare Manufacturing Ltd
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Filing: 1989-12-19
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Granted: 1991-06-25
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Expires: 2009-12-19
Abstract
Abstract In an MR imaging system and method using a surface coil, the intensity of a high frequency magnetic field providing a magnetic resonance signal of the maximum intensity for each of distances from a coil plane of the surface coil to planes to be imaged is determined and stored. When a distance from the coil plane of the surface coil to a desired plate to be imaged is set, data of the high frequency magnetic field stored corresponding to the set distance is read and the intensity of a high frequency magnetic field to be applied is determined on the basis of the read data.
Inventors
- 👤 Kazutoshi Higuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:19
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/32; G01R33/34; G01R33/341
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
147 words
An MR imaging system comprising: (a) a surface coil for applying a high frequency magnetic field to an object to be examined and detecting a magnetic resonance signal therefrom; (b) transmitting means for transmitting a signal for generation of the high frequency magnetic field to said surface coil; (c) storing means for storing the intensity of a high frequency magnetic field providing a magnetic resonance signal of the maximum intensity for each of distances from a coil plane of said surface coil to planes to be imaged; (d) reading means in response to setting of a distance from the coil plane of said surface coil to a desired plane to be imaged for reading data of the high frequency magnetic field intensity corresponding to the set distance from said storing means; and (e) controlling means for controlling said transmitting means on the basis of the read data.
Claim 2
Dependent Claim
147 words
An MR imaging system comprising: (a) a surface coil for applying a high frequency magnetic field to an object to be examined and detecting a magnetic resonance signal therefrom; (b) transmitting means for transmitting a signal for generation of the high frequency magnetic field to said surface coil; (c) storing means for storing the intensity of a high frequency magnetic field providing a magnetic resonance signal of the maximum intensity for each of distances from a coil plane of said surface coil to planes to be imaged; (d) reading means in response to setting of a distance from the coil plane of said surface coil to a desired plane to be imaged for reading data of the high frequency magnetic field intensity corresponding to the set distance from said storing means; and (e) controlling means for controlling said transmitting means on the basis of the read data.
Claim 3
Dependent Claim
43 words
An MR imaging system according to claim 1, wherein said transmitting means includes a high frequency oscillator, a modulator, a modulating signal generator, a variable attenuator and a high frequency power amplifier, and said controlling means includes means for controlling said variable attenuator.
Claim 4
Dependent Claim
152 words
An MR imaging system comprising: (a) a surface coil for applying a high frequency magnetic field to an object to be examined and detecting a magnetic resonance signal therefrom; (b) transmitting means for transmitting a signal for generation of the high frequency magnetic field to said surface coil; (c) setting means for setting a distance from a coil plane of said surface coil to a desired plane to be imaged; (d) comparing means for comparing the intensities of the magnetic resonance signals detected under the set distance with the intensity of the high frequency magnetic field being changed; (e) determining means for determining from the comparison the intensity of a high frequency magnetic field which provides a magnetic resonance signal of the maximum intensity; and (f) controlling means for controlling said transmitting means so that a high frequency magnetic field having the determined intensity is applied to said object to be examined.
Claim 5
Dependent Claim
152 words
An MR imaging system comprising: (a) a surface coil for applying a high frequency magnetic field to an object to be examined and detecting a magnetic resonance signal therefrom; (b) transmitting means for transmitting a signal for generation of the high frequency magnetic field to said surface coil; (c) setting means for setting a distance from a coil plane of said surface coil to a desired plane to be imaged; (d) comparing means for comparing the intensities of the magnetic resonance signals detected under the set distance with the intensity of the high frequency magnetic field being changed; (e) determining means for determining from the comparison the intensity of a high frequency magnetic field which provides a magnetic resonance signal of the maximum intensity; and (f) controlling means for controlling said transmitting means so that a high frequency magnetic field having the determined intensity is applied to said object to be examined.
Claim 6
Dependent Claim
43 words
An MR imaging system according to claim 3, wherein said transmitting means includes a high frequency oscillator, a modulator, a modulating signal generator, a variable attenuator and a high frequency power amplifier, and said controlling means includes means for controlling said variable attenuator.
Claim 7
Dependent Claim
115 words
An MR imaging method comprising: (a) a step of storing in a memory the intensity of a high frequency magnetic field providing a magnetic resonance signal of the maximum intensity for each of distances from the coil plane of a surface coil to planes to be imaged; (b) a step of reading, upon setting of a distance from the coil plane of said surface coil to a desired plane to be imaged, data of the high frequency magnetic field intensity stored corresponding to the set distance from said memory; and (c) a step of controlling the intensity of a high frequency magnetic field applied from said surface coil on the basis of the read data.
Claim 8
Dependent Claim
115 words
An MR imaging method comprising: (a) a step of storing in a memory the intensity of a high frequency magnetic field providing a magnetic resonance signal of the maximum intensity for each of distances from the coil plane of a surface coil to planes to be imaged; (b) a step of reading, upon setting of a distance from the coil plane of said surface coil to a desired plane to be imaged, data of the high frequency magnetic field intensity stored corresponding to the set distance from said memory; and (c) a step of controlling the intensity of a high frequency magnetic field applied from said surface coil on the basis of the read data.
Claim 9
Dependent Claim
103 words
An MR imaging method comprising: (a) a step of setting a distance from the coil plane of a surface coil to a desired plane to be imaged; (b) a step of comparing the intensities of magnetic resonance signals detected under the set distance with the intensity of a high frequency magnetic field being changed; (c) a step of determining from the comparison the intensity of a high frequency magnetic field which provides a magnetic resonance signal of the maximum intensity; and (d) a step of applying a high frequency magnetic field having the determined intensity from said surface coil to carry out imaging.
Claim 10
Dependent Claim
103 words
An MR imaging method comprising: (a) a step of setting a distance from the coil plane of a surface coil to a desired plane to be imaged; (b) a step of comparing the intensities of magnetic resonance signals detected under the set distance with the intensity of a high frequency magnetic field being changed; (c) a step of determining from the comparison the intensity of a high frequency magnetic field which provides a magnetic resonance signal of the maximum intensity; and (d) a step of applying a high frequency magnetic field having the determined intensity from said surface coil to carry out imaging.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-06-24 | 1994-12-24 | 1995-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-24 | 1998-12-24 | 1999-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-24 | 2002-12-24 | 2003-06-25 | $7700.00 | Window Closed / Lapsed |