Patent US5294886A successfully refreshed from Google Patents.
US5294886A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antenna system for a magnetic resonance imaging tomography apparatus
Assignee: Siemens AG
•
Filing: 1992-04-22
•
Granted: 1994-03-15
•
Expires: 2012-04-22
Abstract
Abstract In a magnetic resonance imaging tomography apparatus having a transmission antenna for exciting nuclear spins in an examination subject, and a reception antenna in the form of a local coil, the feeder for the local coil is provided with decoupling elements. The decoupling elements prevent a coupling of the electrical field of the transmission antenna with the feeder for the local coil.
Inventors
- 👤 Wilhelm Duerr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:53
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/32; G01R33/36; G01R33/3685; G01R33/3642; G01R33/3657
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
85 words
In a magnetic resonance imaging tomography apparatus having a transmission antenna for exciting nuclear spins in an examination subject and a reception antenna for receiving signals of excited nuclei in said examination subject in the form of a local coil, the improvement comprising: a feeder for said local coil having a plurality of decoupling elements connected therein and disposed at predetermined intervals along a length of said feeder and dividing said feeder into a plurality of individual conductor elements which are decoupled from each other.
Claim 2
Dependent Claim
85 words
In a magnetic resonance imaging tomography apparatus having a transmission antenna for exciting nuclear spins in an examination subject and a reception antenna for receiving signals of excited nuclei in said examination subject in the form of a local coil, the improvement comprising: a feeder for said local coil having a plurality of decoupling elements connected therein and disposed at predetermined intervals along a length of said feeder and dividing said feeder into a plurality of individual conductor elements which are decoupled from each other.
Claim 3
Dependent Claim
11 words
The improvement of claim 1 wherein said decoupling elements are inductances.
Claim 4
Dependent Claim
17 words
The improvement of claim 2 wherein said decoupling elements are formed by a plurality of conductor loops.
Claim 5
Dependent Claim
29 words
The improvement of claim 3 wherein said conductor loops are bridged by a resonance capacitor forming a parallel resonant circuit in combination with the inductances of said conductor loops.
Claim 6
Dependent Claim
20 words
The improvement of claim 1 wherein said decoupling elements are formed by two cylinder coils in the form a figure-eight.
Claim 7
Dependent Claim
12 words
The improvement of claim 5 wherein each cylinder coil has rectangular windings.
Claim 8
Dependent Claim
27 words
The improvement of claim 6 wherein said windings of said cylinder coils are wound on a core consisting of non-magnetic material having a substantially rectangular cross section.
Claim 9
Dependent Claim
19 words
The improvement of claim 1 wherein at least one toroidal surface wave trap is provided as a decoupling element.
Claim 10
Dependent Claim
18 words
The improvement of claim 1 further comprising a reception amplifier connected between said local coil and decoupling elements.
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) | 1997-03-14 | 1997-09-13 | 1998-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-03-14 | 2001-09-13 | 2002-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-03-14 | 2005-09-13 | 2006-03-15 | $7700.00 | Window Closed / Lapsed |