US5227727A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio-frequency magnetic field regulating apparatus for magnetic resonance imaging
Assignee: Toshiba Corp
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Filing: 1991-12-17
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Granted: 1993-07-13
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Expires: 2011-12-17
Abstract
Abstract Between at least one of a transmitting coil and a receiving coil and a subject to be examined is interposed a member containing a high molecular compound such as a molded sheet of nonconductive fiber or rubber, a PVA gel sheet or a PAR gel sheet. Thereby, the radio-frequency magnetic field distribution can be regulated with ease without adjusting hardware or software of a magnetic resonance diagnostic apparatus, thus permitting diagnosises to be made with high accuracy.
Inventors
- 👤 Toru Segawa
- 👤 Junichi Makita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:47
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/32; G01R33/36; G01R33/44; G01R33/48; G01R33/54; G01R33/56; G01R33/565; G01R33/5659
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
97 words
For use in a magnetic resonance diagnostic apparatus which produces a magnetic resonance phenomenon in a specific region of a subject to be examined placed in a static magnetic field by irradiating said subject with an excitation radio-frequency pulse from a transmitting coil and collecting magnetic resonance signals produced by the magnetic resonance phenomenon by using a receiving coil, thereby obtaining diagnostic information on said specific region, a radio-frequency magnetic field regulating device comprising a member interposed between at least one of said transmitting and receiving coils and said subject to be examined and having dielectric property.
Claim 2
Dependent Claim
97 words
For use in a magnetic resonance diagnostic apparatus which produces a magnetic resonance phenomenon in a specific region of a subject to be examined placed in a static magnetic field by irradiating said subject with an excitation radio-frequency pulse from a transmitting coil and collecting magnetic resonance signals produced by the magnetic resonance phenomenon by using a receiving coil, thereby obtaining diagnostic information on said specific region, a radio-frequency magnetic field regulating device comprising a member interposed between at least one of said transmitting and receiving coils and said subject to be examined and having dielectric property.
Claim 3
Dependent Claim
18 words
A radio-frequency magnetic field regulating device according to claim 1, in which said member includes a conductive substance.
Claim 4
Dependent Claim
19 words
A radio-frequency magnetic field regulating device according to claim 1, in which said member includes an electrolytic aqueous solution.
Claim 5
Dependent Claim
24 words
A radio-frequency magnetic field regulating device according to claim 1, in which said member comprises a high molecular material containing an electrolytic aqueous solution.
Claim 6
Dependent Claim
36 words
A radio-frequency magnetic field regulating device according to claim 4, in which said electrolytic aqueous solution is an inorganic ion aqueous solution such as Na + , K + , Ca 2+ or Cl - .
Claim 7
Dependent Claim
21 words
A radio-frequency magnetic field regulating device according to claim 4, in which said high molecular gel material is a poly-acryl resin.
Claim 8
Dependent Claim
20 words
A radio-frequency magnetic field regulating device according to claim 4, in which said high molecular gel material is poly-vinyl alcohol.
Claim 9
Dependent Claim
35 words
A radio-frequency magnetic field regulating device according to claim 1, in which said substance has a property for growing a region where the flux density of a radio-frequency magnetic field near said member is increased.
Claim 10
Dependent Claim
109 words
For use in a magnetic resonance diagnostic apparatus which produces a magnetic resonance phenomenon in a specific region of a subject to be examined placed in a static magnetic field by irradiating said subject with an excitation radio-frequency pulse from a transmitting coil and collecting magnetic resonance signals produced by the magnetic resonance phenomenon by using a receiving coil, thereby obtaining diagnostic information on said specific region, a radio-frequency magnetic field regulating device comprising a member interposed between at least one of said transmitting and receiving coils and said subject to be examined and formed by molding a non-magnetic conductive metal into a predetermined shape with a molding material.
Claim 11
Dependent Claim
109 words
For use in a magnetic resonance diagnostic apparatus which produces a magnetic resonance phenomenon in a specific region of a subject to be examined placed in a static magnetic field by irradiating said subject with an excitation radio-frequency pulse from a transmitting coil and collecting magnetic resonance signals produced by the magnetic resonance phenomenon by using a receiving coil, thereby obtaining diagnostic information on said specific region, a radio-frequency magnetic field regulating device comprising a member interposed between at least one of said transmitting and receiving coils and said subject to be examined and formed by molding a non-magnetic conductive metal into a predetermined shape with a molding material.
Claim 12
Dependent Claim
22 words
A radio-frequency magnetic field regulating device according to claim 9, in which said non-magnetic conductive metal is in the form of foil.
Claim 13
Dependent Claim
27 words
A radio-frequency magnetic field regulating device according to claim 9, in which said non-magnetic conductive metal is in the form of a mesh sheet for RF shielding.
Claim 14
Dependent Claim
22 words
A radio-frequency magnetic field regulating device according to claim 9, in which said molding material is a nonconductive fiber high molecular compound.
Claim 15
Dependent Claim
21 words
A radio-frequency magnetic field regulating device according to claim 9, in which said molding material is a rubber high molecular compound.
Claim 16
Dependent Claim
21 words
A radio-frequency magnetic field regulating device according to claim 9, in which said predetermined shape is the shape of a sheet.
Claim 17
Dependent Claim
105 words
For use in a magnetic resonance diagnostic apparatus which produces a magnetic resonance phenomenon in a specific region of a subject to be examined placed in a static magnetic field by irradiating said subject with an excitation radio-frequency pulse from a transmitting coil and collecting magnetic resonance signals produced by the magnetic resonance phenomenon by using a receiving coil, thereby obtaining diagnostic information on said specific region, a radio-frequency magnetic field regulating device comprising a member interposed between at least one of said transmitting and receiving coils and said subject to be examined and formed by filling a bag with a non-magnetic conductive gel material.
Claim 18
Dependent Claim
105 words
For use in a magnetic resonance diagnostic apparatus which produces a magnetic resonance phenomenon in a specific region of a subject to be examined placed in a static magnetic field by irradiating said subject with an excitation radio-frequency pulse from a transmitting coil and collecting magnetic resonance signals produced by the magnetic resonance phenomenon by using a receiving coil, thereby obtaining diagnostic information on said specific region, a radio-frequency magnetic field regulating device comprising a member interposed between at least one of said transmitting and receiving coils and said subject to be examined and formed by filling a bag with a non-magnetic conductive gel material.
Claim 19
Dependent Claim
20 words
A radio-frequency magnetic field regulating device according to claim 15, in which said bag is formed of a high-molecular compound.
Claim 20
Dependent Claim
18 words
A radio-frequency magnetic field regulating device according to claim 15, in which said bag is formed of rubber.
Claim 21
Dependent Claim
31 words
A radio-frequency magnetic field regulating device according to claim 15, in which said non-magnetic conductive gel material is formed of a high-molecular compound impregnated with an inorganic electrolytic ion aqueous solution.
Claim 22
Dependent Claim
19 words
A radio-frequency magnetic field regulating device according to claim 18, in which said high molecular compound is poly-vinyl alcohol.
Claim 23
Dependent Claim
35 words
A radio-frequency magnetic field regulating device according to claim 18, in which said inorganic electrolytic ion aqueous solution contains at least one of Na + , K + , Ca 2+ or Cl - .
Claim 24
Dependent Claim
108 words
For use in a magnetic resonance diagnostic apparatus which produces a magnetic resonance phenomenon in a specific region of a subject to be examined placed in a static magnetic field by irradiating said subject with an excitation radio-frequency pulse from a transmitting coil and collecting magnetic resonance signals produced by the magnetic resonance phenomenon by using a receiving coil, thereby obtaining diagnostic information on said specific region, a radio-frequency magnetic field regulating device comprising a bag interposed between at least one of said transmitting and receiving coils and said subject to be examined and filled with a high molecular compound impregnated with an inorganic electrolytic ion aqueous solution.
Claim 25
Dependent Claim
108 words
For use in a magnetic resonance diagnostic apparatus which produces a magnetic resonance phenomenon in a specific region of a subject to be examined placed in a static magnetic field by irradiating said subject with an excitation radio-frequency pulse from a transmitting coil and collecting magnetic resonance signals produced by the magnetic resonance phenomenon by using a receiving coil, thereby obtaining diagnostic information on said specific region, a radio-frequency magnetic field regulating device comprising a bag interposed between at least one of said transmitting and receiving coils and said subject to be examined and filled with a high molecular compound impregnated with an inorganic electrolytic ion aqueous solution.
Claim 26
Dependent Claim
20 words
A radio-frequency magnetic field regulating device according to claim 21, in which said high molecular compound is a poly-acryl resin.
Claim 27
Dependent Claim
35 words
A radio-frequency magnetic field regulating device according to claim 21, in which said inorganic electrolytic ion aqueous solution contains at least one of Na + , K + , Ca 2+ or Cl - .
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) | 1996-07-12 | 1997-01-11 | 1997-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-12 | 2001-01-11 | 2001-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-12 | 2005-01-11 | 2005-07-13 | $7700.00 | Window Closed / Lapsed |