US5202634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double surface coil for a nuclear magnetic resonance apparatus
Assignee: Siemens AG
•
Filing: 1991-09-23
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Granted: 1993-04-13
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Expires: 2011-09-23
Abstract
Abstract A double surface coil for a nuclear magnetic resonance apparatus has two individual coils which are connectable to a transmission/reception circuit via a matching network. The coils are connected together at a junction. Each coil has a controllable switch connected between the junction and the matching circuit. The individual surface coils can thus be controlled with a low number of controlled elements in any desired operating mode.
Inventors
- 👤 Andreas Potthast
- 👤 Guenther Decke
- 👤 Hermann Requardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:55
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/32; G01R33/36; G01R33/3628; G01R33/34; G01R33/341
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
83 words
A double surface coil for use in a nuclear magnetic resonance apparatus having a transmission/reception circuit with a matching network connected thereto, said double surface coil comprising: first and second individual coils having a common junction, each individual coil having a terminal connectable to said matching network; and each coil having a controllable switch connected between said common junction and said terminal, said controllable switches being operable in combination for selectively connecting one or both of said individual coils to said matching circuit.
Claim 2
Dependent Claim
83 words
A double surface coil for use in a nuclear magnetic resonance apparatus having a transmission/reception circuit with a matching network connected thereto, said double surface coil comprising: first and second individual coils having a common junction, each individual coil having a terminal connectable to said matching network; and each coil having a controllable switch connected between said common junction and said terminal, said controllable switches being operable in combination for selectively connecting one or both of said individual coils to said matching circuit.
Claim 3
Dependent Claim
47 words
A double surface coil as claimed in claim 1 wherein each of said individual coils includes a further controllable switch connected between said common junction and said terminal, said second controllable switch being open as long as the associated individual coil is not in a reception mode.
Claim 4
Dependent Claim
51 words
A double surface coil as claimed in claim 1 wherein said controllable switches and said further controllable switches are each formed by a PIN diode, each PIN diode having a blocking capacitor connected in series therewith, and each PIN diode being connected to a respective control voltage input via an inductor.
Claim 5
Dependent Claim
31 words
A double surface coil as claimed in claim 3 wherein each of said further controllable switches includes means for inverting the switching effect of the further controllable switch by a quarter-wave.
Claim 6
Dependent Claim
46 words
A double surface coil as claimed in claim 3 wherein said PIN diodes are supplied with a control voltage having a reference potential associated therewith, and wherein said double surface coil further comprises respective inductors connecting said terminals of said individual coils to said reference potential.
Claim 7
Dependent Claim
18 words
A double surface coil as claimed in claim 1 wherein said individual coils are disposed side-by-side for mammography.
Claim 8
Dependent Claim
17 words
A double surface coil as claimed in claim 1 wherein said common junction is a connecting branch.
Claim 9
Dependent Claim
46 words
A double surface coil as claimed in claim 1 wherein said controllable switches are each formed by a PIN diode, with each PIN diode having a blocking capacitor connected in series therewith, and each PIN diode having a respective control voltage input connected to an inductor.
Claim 10
Dependent Claim
44 words
A double surface coil as claimed in claim 8 wherein said control voltage for said PIN diodes has a reference potential associated therewith, and wherein said double surface coil further comprises respective inductors connecting said terminals of said individual coils to said reference potential.
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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) | 1996-04-12 | 1996-10-12 | 1997-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-12 | 2000-10-12 | 2001-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-12 | 2004-10-12 | 2005-04-13 | $7700.00 | Window Closed / Lapsed |