Patent US4893083A successfully refreshed from Google Patents.
US4893083A
Expired / Lapsed
US
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Magnetic resonance apparatus comprising integrated gradient r.f. coils
Assignee: US Philips Corp
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Filing: 1988-08-17
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Granted: 1990-01-09
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Expires: 2008-08-17
Abstract
Abstract In a magnetic resonance apparatus a gradient coil system and an r.f. coil are combined so as to form a magnetically, electrically and structurally integrated coil system with current conductors in substantially the same cylinder. Thus, a substantial saving is realized as regards the activation energy required for generating gradient fields as well as for generating r.f. fields and notably r.f. stray-fields are also reduced.
Inventors
- 👤 Johannes A. Overweg
- 👤 Wilhelmus R. M. Mens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:47
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/32; G01R33/34; G01R33/34046; G01R33/38; G01R33/385
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
86 words
A magnetic resonance apparatus, comprising a magnet system for generating a steady magnetic field, a magnet system for generating mutually perpendicular field gradients, and an r.f. coil for generating a spatially uniform r.f. magnetic field, characterized in that the gradient coil system and the r.f. coil are combined so as to form a magnetically and structurally integrated gradient/r.f. coil system and in that current conductors of the gradient coil system and current conductors of the r.f. coil are situated in substantially the same cylinder generated surface.
Claim 2
Dependent Claim
86 words
A magnetic resonance apparatus, comprising a magnet system for generating a steady magnetic field, a magnet system for generating mutually perpendicular field gradients, and an r.f. coil for generating a spatially uniform r.f. magnetic field, characterized in that the gradient coil system and the r.f. coil are combined so as to form a magnetically and structurally integrated gradient/r.f. coil system and in that current conductors of the gradient coil system and current conductors of the r.f. coil are situated in substantially the same cylinder generated surface.
Claim 3
Dependent Claim
27 words
A magnetic resonance apparatus as claimed in claim 1, characterized in that current conductors of a gradient coil system act as shielding members for the r.f. coil.
Claim 4
Dependent Claim
56 words
A magnetic resonance apparatus as claimed in claim 2, characterized in that the location of the current conductors of the gradient coil system and current conductors of the r.f. coil with respect to one another is adapted so as to obtain optimum spatial homogeneity of the r.f. magnetic field to be generated in a measuring space.
Claim 5
Dependent Claim
41 words
A magnetic resonance apparatus as claimed in claim 3, characterized in that, viewed axially, current conductors of the gradient coil system which are situated further outwards are located so as to obtain optimum shielding of an r.f. stray-field at that area.
Claim 6
Dependent Claim
30 words
A magnetic resonance apparatus as claimed in claim 1, characterized in that current conductors of the r.f. coil are accommodated in recesses in structural members of the gradient coil system.
Claim 7
Dependent Claim
56 words
A magnetic resonance apparatus as claimed in claim 1, characterized in that said current conductors of the gradient coil system are arc conductors and wherein arc conductors of the gradient coil system which are situated further outwards from a central symmetry plane have a diameter which is larger than that of more centrally situated arc conductors.
Claim 8
Dependent Claim
38 words
A magnetic resonance apparatus as claimed in claim 1, characterized in that the integrated coil system is symmetrically situated with respect to two mutually perpendicular axial planes in order to enable quadrature generation of the r.f. magnetic field.
Claim 9
Dependent Claim
68 words
A magnetic resonance apparatus, comprising a magnet system for generating mutually perpendicular field gradients, and an r.f. coil for generating a spatially uniform r.f. magnetic field, characterized in that the gradient coil system and the r.f. coil are combined so as to form a magnetically and structurally integrated gradient/r.f. coil system in that current conductors of the gradient coil system act as shielding members for the r.f. coil.
Claim 10
Dependent Claim
68 words
A magnetic resonance apparatus, comprising a magnet system for generating mutually perpendicular field gradients, and an r.f. coil for generating a spatially uniform r.f. magnetic field, characterized in that the gradient coil system and the r.f. coil are combined so as to form a magnetically and structurally integrated gradient/r.f. coil system in that current conductors of the gradient coil system act as shielding members for the r.f. coil.
Claim 11
Dependent Claim
56 words
A magnetic resonance apparatus as claimed in claim 8, characterized in that the location of the current conductors of the gradient coil system and current conductors of the r.f. coil with respect to one another is adapted so as to obtain optimum spatial homogeneity of the r.f. magnetic field to be generated in a measuring space.
Claim 12
Dependent Claim
41 words
A magnetic resonance apparatus as claimed in claim 9, characterized in that, viewed axially, current conductors of the gradient coil system which are situated further outwards are located so as to obtain optimum shielding of an r.f. stray-field at that area.
Claim 13
Dependent Claim
30 words
A magnetic resonance apparatus as claimed in claim 8, characterized in that current conductors of the r.f. coil are accommodated in recesses in structural members of the gradient coil system.
Claim 14
Dependent Claim
56 words
A magnetic resonance apparatus as claimed in claim 8, characterized in that said current conductors of the gradient coil system are arc conductors and wherein arc conductors of the gradient coil system which are situated further outwards from a central symmetry plane have a diameter which is larger than that of more centrally situated arc conductors.
Claim 15
Dependent Claim
38 words
A magnetic resonance apparatus as claimed in claim 8, characterized in that the integrated coil system is symmetrically situated with respect to two mutually perpendicular axial planes in order to enable quadrature generation of the r.f. magnetic field.
Claim 16
Dependent Claim
66 words
A magnetic resonance apparatus, comprising a magnet system for generating mutually perpendicular field gradients, and an r.f. coil system for quadrature generating a circularly polarized r.f. magnetic field, characterized in that the gradient coil system and the r.f. coil system are combined so as to form a magnetically and structurally integrated gradient/r.f. coil system which is symmetrically situated with respect to two mutually perpendicular axial planes.
Claim 17
Dependent Claim
66 words
A magnetic resonance apparatus, comprising a magnet system for generating mutually perpendicular field gradients, and an r.f. coil system for quadrature generating a circularly polarized r.f. magnetic field, characterized in that the gradient coil system and the r.f. coil system are combined so as to form a magnetically and structurally integrated gradient/r.f. coil system which is symmetrically situated with respect to two mutually perpendicular axial planes.
Claim 18
Dependent Claim
27 words
A magnetic resonance apparatus as claimed in claim 14, characterized in that current conductors of the gradient coil system act as shielding members for the r.f. coil.
Claim 19
Dependent Claim
55 words
A magnetic resonance apparatus as claimed in claim 14, characterized in that the location of current conductors of the gradient coil system and current conductors of the r.f. coil with respect to one another is adapted so as to obtain optimum spatial homogeneity of the r.f. magnetic field to be generated in a measuring space.
Claim 20
Dependent Claim
41 words
A magnetic resonance apparatus as claimed in claim 15, characterized in that, viewed axially, current conductors of the gradient coil system which are situated further outwards are located so as to obtain optimum shielding of an r.f. stray-field at that area.
Claim 21
Dependent Claim
30 words
A magnetic resonance apparatus as claimed in claim 14, characterized in that current conductors of the r.f. coil are accommodated in recesses in structural members of the gradient coil system.
Claim 22
Dependent Claim
56 words
A magnetic resonance apparatus as claimed in claim 14, characterized in that said current conductors of the gradient coil system are arc conductors and wherein arc conductors of the gradient coil system which are situated further outwards from a central symmetry plane have a diameter which is larger than that of more centrally situated arc conductors.
Claim 23
Dependent Claim
106 words
A magnetic resonance apparatus comprising a magnet system for generating a steady magnetic field along an axis, a magnet system for generating mutually perpendicular field gradients, and an r.f. coil for generating an r.f. magnetic field, characterized in that the gradient coil system and the r.f. coil are combined so as to form an integrated gradient/r.f. coil system including an axially directed supporting member having an inside diameter, said gradient coil system comprising a plurality of stacks of current conductors, which stacks are carried on the inside diameter of said supporting member, and said r.f. coil including r.f. current conductors which are supported by said stacks.
Claim 24
Dependent Claim
106 words
A magnetic resonance apparatus comprising a magnet system for generating a steady magnetic field along an axis, a magnet system for generating mutually perpendicular field gradients, and an r.f. coil for generating an r.f. magnetic field, characterized in that the gradient coil system and the r.f. coil are combined so as to form an integrated gradient/r.f. coil system including an axially directed supporting member having an inside diameter, said gradient coil system comprising a plurality of stacks of current conductors, which stacks are carried on the inside diameter of said supporting member, and said r.f. coil including r.f. current conductors which are supported by said stacks.
Claim 25
Dependent Claim
41 words
A magnetic resonance apparatus as claimed in claim 20, wherein said stacks of current conductors are radial stacks of arc conductors, and wherein the supported current conductors of said r.f. coil are axially directed radially between arc conductors of said stacks.
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) | 1993-01-08 | 1993-07-10 | 1994-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-08 | 1997-07-10 | 1998-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-08 | 2001-07-10 | 2002-01-09 | $7700.00 | Window Closed / Lapsed |