← Back to Patent Explorer
US5500596A Expired / Lapsed US ⏱️ 0.0 years remaining

Local coil array for magnetic resonance imaging of the lower extremities

Assignee: Wisconsin Alumni Research Foundation
•
Filing: 1994-04-28
•
Granted: 1996-03-19
•
Expires: 2014-04-28
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract A local coil for use with an MRI system to acquire images of a patient's legs includes a vertically disposed central coil positioned between the legs, and a pair of horizontally disposed flange coils positioned above and below the legs. In one embodiment of the central coil is a phased array of two coils, and the four coils are connected to the respective inputs of a four channel receiver, and in a second embodiment, the signals from the three coils are combined before application to the input of a single-channel receiver.

Inventors

  • 👤 Thomas M. Grist
  • 👤 Marcus T. Alley

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 00:10
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/32; G01R33/34; G01R33/341; G01R33/34046; G01R33/34061; G01R33/3415; G01R33/36; G01R33/3642

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 199 words
A local coil for acquiring NMR signals produced by excited spins in the legs of a patient, the combination comprising: a central coil disposed in a first plane and positioned between the patient's legs, and extending along the lengthwise dimension of the legs, the central coil being operable to produce a signal in response to NMR signals emanating from the legs; a first flange coil disposed in a second plane substantially perpendicular to the first plane and positioned to extend over the top of both of the patient's legs, and extending along the lengthwise dimension substantially coextensively with the central coil, the first flange coil being operable to produce a second signal in response to NMR signals emanating from the patient's leg; a second flange coil disposed in a third plane substantially perpendicular to the first plane and positioned to extend beneath both of the patient's legs, and extending along the lengthwise dimension substantially coextensively with the central coil, the second flange coil being operable to produce a third signal in response to NMR signals emanating from the patient's legs; and means for combining the signals acquired from said three coils to produce an image of the patient's leg.
Claim 2
Dependent Claim 199 words
A local coil for acquiring NMR signals produced by excited spins in the legs of a patient, the combination comprising: a central coil disposed in a first plane and positioned between the patient's legs, and extending along the lengthwise dimension of the legs, the central coil being operable to produce a signal in response to NMR signals emanating from the legs; a first flange coil disposed in a second plane substantially perpendicular to the first plane and positioned to extend over the top of both of the patient's legs, and extending along the lengthwise dimension substantially coextensively with the central coil, the first flange coil being operable to produce a second signal in response to NMR signals emanating from the patient's leg; a second flange coil disposed in a third plane substantially perpendicular to the first plane and positioned to extend beneath both of the patient's legs, and extending along the lengthwise dimension substantially coextensively with the central coil, the second flange coil being operable to produce a third signal in response to NMR signals emanating from the patient's legs; and means for combining the signals acquired from said three coils to produce an image of the patient's leg.
Claim 3
Dependent Claim 26 words
The local coil as recited in claim 1 in which the central coil is comprised of a plurality of separate coils disposed along the lengthwise dimension.
Claim 4
Dependent Claim 27 words
The local coil as recited in claim 2 in which the plurality of separate coils in the central coil are configured to minimize the mutual inductance therebetween.
Claim 5
Dependent Claim 30 words
The local coil as recited in claim 1 in which the first and second flange coils are each comprised of a plurality of separate coils disposed along the lengthwise dimension.
Claim 6
Dependent Claim 40 words
The local coil as recited in claim 4 in which the first and second flange coils extend beyond the lengthwise dimension of the central coil to enable the acquisition of NMR signals from the pelvic region adjacent the patient's legs.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1999-03-19 1999-09-18 2000-03-19 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2003-03-19 2003-09-18 2004-03-19 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2007-03-19 2007-09-18 2008-03-19 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag