Patent US4767993A successfully refreshed from Google Patents.
US4767993A
Expired / Lapsed
US
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Coil system for magnetic resonance imaging
Assignee: Toshiba Corp
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Filing: 1987-07-20
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Granted: 1988-08-30
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Expires: 2007-07-20
Abstract
Abstract A coil system for magnetic resonance imaging in a magnetic resonance imaging system, used to transmit the excitation pulse and to receive the magnetic resonance signals, includes a first coil for transmitting a predetermined high-frequency pulse, second and third coils, arranged on a propagation path of the magnetic resonance signal at a position closer to the object to be examined than the first coil in directions orthogonal to each other, for receiving the magnetic resonance signals, and a pair of tuning elements, respectively provided in association with the second and third coils, for tuning the second and third coils to predetermined magnetic resonance signals. The tuning elements tune the second and third coils slightly offset from accurate tuning points so that voltage phases of the magnetic resonance signals received through the second and third coils coincide with each other.
Inventors
- 👤 Masatoshi Hanawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:34
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/32; G01R33/36; G01R33/3678; G01R33/44; G01R33/48; G01R33/54; G01R33/56
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
175 words
A coil system for magnetic resonance imaging in a magnetic resonance imaging system for applying a predetermined excitation pulse to an object to be examined arranged in a predetermined magnetic field to generate a magnetic resonance phenomenon, and for detecting and acquiring magnetic resonance signals generated by the magnetic resonance phenomenon to reconstruct a magnetic resonance image of the object, said coil system transmitting the excitation pulse and receiving the magnetic resonance signals, and comprising: first coil means for transmitting the predetermined excitation pulse; second and third coil means, arranged on a propagation path of the magnetic resonance signal at a position closer to the object than said first coil means in directions orthogonal to each other, for receiving the magnetic resonance signals; and a pair of tuning means, respectively provided in association with said second and third coil means, for tuning said second and third coil means slightly offset from accurate tuning points so that voltage phases of the magnetic resonance signals received through said second and third coil means coincide with each other.
Claim 2
Dependent Claim
175 words
A coil system for magnetic resonance imaging in a magnetic resonance imaging system for applying a predetermined excitation pulse to an object to be examined arranged in a predetermined magnetic field to generate a magnetic resonance phenomenon, and for detecting and acquiring magnetic resonance signals generated by the magnetic resonance phenomenon to reconstruct a magnetic resonance image of the object, said coil system transmitting the excitation pulse and receiving the magnetic resonance signals, and comprising: first coil means for transmitting the predetermined excitation pulse; second and third coil means, arranged on a propagation path of the magnetic resonance signal at a position closer to the object than said first coil means in directions orthogonal to each other, for receiving the magnetic resonance signals; and a pair of tuning means, respectively provided in association with said second and third coil means, for tuning said second and third coil means slightly offset from accurate tuning points so that voltage phases of the magnetic resonance signals received through said second and third coil means coincide with each other.
Claim 3
Dependent Claim
60 words
A system according to claim 1, wherein said tuning means include means for tuning with respect to a signal supposed to be induced in one of said second and third coil means in a phase advanced by substantially 45° and tuning with respect to a signal supposed to be induced in the other in a phase delayed by substantially 45°.
Claim 4
Dependent Claim
23 words
A system according to claim 1, wherein said tuning means include capacitors respectively connected in parallel with said second and third coil means.
Claim 5
Dependent Claim
22 words
A system according to claim 1, wherein said tuning means include variable capacitors respectively connected to said second and third coil means.
Claim 6
Dependent Claim
23 words
A system according to claim 1, wherein said tuning means include inductors respectively connected in series with said second and third coil means.
Claim 7
Dependent Claim
24 words
A system according to claim 1, wherein said tuning means include variable inductors respectively connected in series with said second and third coil means.
Claim 8
Dependent Claim
25 words
A system according to claim 1, wherein said second and third coil means are respectively offset from said first coil through 45° in opposite directions.
Claim 9
Dependent Claim
21 words
A system according to claim 1, wherein each of said second and third coil means includes a pair of saddle coils.
Claim 10
Dependent Claim
21 words
A system according to claim 1, wherein each of said second and third coil means includes a pair of elliptic coils.
Claim 11
Dependent Claim
17 words
A system according to claim 1, wherein said first coil means includes a pair of saddle coils.
Claim 12
Dependent Claim
194 words
A coil system for magnetic resonance imaging in a magnetic resonance imaging system for applying a predetermined excitation pulse to an object to be examined arranged in a predetermined magnetic field to generate a magnetic resonance phenomenon, and for detecting and acquiring magnetic resonance signals generated by the magnetic resonance phenomenon to reconstruct a magnetic resonance image of the object, said coil system transmitting the excitation pulse and receiving the magnetic resonance signals, and comprising: first coil means for transmitting the predetermined excitation pulse; second and third coil means, arranged on a propagation path of the magnetic resonance signal at a position closer to the object than said first coil means in directions orthogonal to each other, for receiving the magnetic resonance signals; and a pair of tuning means, respectively provided in association with said second and third coil means, for tuning said second and third coil means to predetermined magnetic resonance signals, wherein said tuning means include means for tuning said second and third coil means slightly offset from accurate tuning points so that voltage phases of the magnetic resonance signals received through said second and third coil means coincide with each other.
Claim 13
Dependent Claim
194 words
A coil system for magnetic resonance imaging in a magnetic resonance imaging system for applying a predetermined excitation pulse to an object to be examined arranged in a predetermined magnetic field to generate a magnetic resonance phenomenon, and for detecting and acquiring magnetic resonance signals generated by the magnetic resonance phenomenon to reconstruct a magnetic resonance image of the object, said coil system transmitting the excitation pulse and receiving the magnetic resonance signals, and comprising: first coil means for transmitting the predetermined excitation pulse; second and third coil means, arranged on a propagation path of the magnetic resonance signal at a position closer to the object than said first coil means in directions orthogonal to each other, for receiving the magnetic resonance signals; and a pair of tuning means, respectively provided in association with said second and third coil means, for tuning said second and third coil means to predetermined magnetic resonance signals, wherein said tuning means include means for tuning said second and third coil means slightly offset from accurate tuning points so that voltage phases of the magnetic resonance signals received through said second and third coil means coincide with each other.
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) | 1991-08-30 | 1992-02-29 | 1992-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-30 | 1996-02-29 | 1996-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-30 | 2000-02-29 | 2000-08-30 | $7700.00 | Window Closed / Lapsed |