Patent US4859947A successfully refreshed from Google Patents.
US4859947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic resonance imaging apparatus comprising a stacked surface coil system
Assignee: US Philips Corp
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Filing: 1987-11-04
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Granted: 1989-08-22
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Expires: 2007-11-04
Abstract
Abstract A magnetic resonance imaging apparatus includes a cascade of surface coils for detection so that larger objects can be measured while the attractive signal-to-noise ratio of surface coils is retained without mutual re-orientation of coils with respect to the object being required. By introducing a partial overlap between successive coils, suitable homogeneity can be achieved for the detection.
Inventors
- 👤 Eddy B. Boskamp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:55
CPC Classifications
G; G01; G01N; G01N24/00; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/32; G01R33/34; G01R33/341; G01R33/3415
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
90 words
A magnetic resonance imaging apparatus, comprising magnet systems for generating a steady magnetic field and gradient magnetic fields, an rf transmitter coil, and an rf surface coil system for placement along a surface of an object for detecting magnetic resonance signals to be generated in said object, wherein said rf surface coil system comprises a cascade of individually operatively selectable successive, substantially identical surface coils, corresponding parts of each successive coil in said cascade being offset along said object surface from those of the preceding surface coil in said cascade.
Claim 2
Dependent Claim
90 words
A magnetic resonance imaging apparatus, comprising magnet systems for generating a steady magnetic field and gradient magnetic fields, an rf transmitter coil, and an rf surface coil system for placement along a surface of an object for detecting magnetic resonance signals to be generated in said object, wherein said rf surface coil system comprises a cascade of individually operatively selectable successive, substantially identical surface coils, corresponding parts of each successive coil in said cascade being offset along said object surface from those of the preceding surface coil in said cascade.
Claim 3
Dependent Claim
20 words
A magnetic resonance imaging apparatus as claimed in claim 1, characterized in that successive coils of the cascade partly overlap.
Claim 4
Dependent Claim
34 words
A magnetic resonance imaging apparatus as claimed in claim 1, characterized in that a cascade of coils is accommodated in a band-shaped carrier which can be flexibly arranged about an object to be measured.
Claim 5
Dependent Claim
29 words
A magnetic resonance imaging apparatus as claimed in claim 1, characterized in that the cascade comprises coils which are diametrically arranged with respect to an object to be measured.
Claim 6
Dependent Claim
29 words
A magnetic resonance imaging apparatus as claimed in claim 2, characterized in that the cascade comprises coils which are diametrically arranged with respect to an object to be measured.
Claim 7
Dependent Claim
41 words
A magnetic resonance imaging apparatus as claimed in any one of claims 1 to 3, characterized in that the cascade coils are arranged so that detection signals for an image of a cross-section are supplied by one and the same coil.
Claim 8
Dependent Claim
46 words
A magnetic resonance imaging apparatus as claimed in any one of the claims 1 to 3, characterized in that for the measurement of sagittal cross-sections use is made of a cascade configuration of coils, signals from a plurality of coils being used for one complete cross-section.
Claim 9
Dependent Claim
51 words
A magnetic resonance imaging apparatus as claimed in claim 7, characterized in that there are provided signal selection means for obtaining such a combination of detection signals for parts of cross-sections that a complete cross-section can be formed from signals which have all been detected substantially the same time after excitation.
Claim 10
Dependent Claim
26 words
A magnetic resonance imaging apparatus as claimed in any of the claims 1 to 3, characterized in that the cascade of surface coils comprises butterfly coils.
Claim 11
Dependent Claim
34 words
A magnetic resonance imaging apparatus as claimed in claim 2, characterized in that a cascade of coils is accommodated in a band-shaped carrier which can be flexibly arranged about an object to be measured.
Claim 12
Dependent Claim
36 words
A magnetic resonance imaging apparatus as claimed in claim 4 or claim 5, characterized in that one of the coil parts is rigidly connected to an object carrier, a second coil part being adjustably connected thereto.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-21 | 1993-02-20 | 1993-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-21 | 1997-02-20 | 1997-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-21 | 2001-02-20 | 2001-08-22 | $7700.00 | Window Closed / Lapsed |