Doubly resonant high field radio frequency surface coils for magnetic resonance
First Claim
1. A generally planar radio frequency coil comprising:
- a single annular conductor arranged generally parallel with a coil plane of the generally planar radio frequency coil and configured to support both (i) a uniform electrical current distribution generating a first B1 field at a first magnetic resonance frequency directed out of the coil plane and (ii) a sinusoidal electrical current distribution generating a second B1 field at a second magnetic resonance frequency directed parallel with the coil plane, wherein the second magnetic resonance frequency is higher than the first magnetic resonance frequency.
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Accused Products
Abstract
A radio frequency coil comprises an annular conductor or parallel annular conductors (22, 22c, 22d) configured to support: (i) a uniform electrical current distribution generating a first B1 field (B1,uniform) at a first magnetic resonance frequency directed out of a plane of the annular conductor or conductors; and (ii) a sinusoidal electrical current distribution generating a second B1 field (B1,sine) at a second magnetic resonance frequency directed parallel with the plane of the annular conductor or conductors. A magnetic resonance scanner comprises: a magnet (10) generating a static magnetic field (B0); a magnetic field gradient system (14) configured to superimpose selected magnetic field gradients on the static magnetic field; and said radio frequency coil including said annular conductor or parallel annular conductors (22, 22c, 22d).
27 Citations
23 Claims
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1. A generally planar radio frequency coil comprising:
a single annular conductor arranged generally parallel with a coil plane of the generally planar radio frequency coil and configured to support both (i) a uniform electrical current distribution generating a first B1 field at a first magnetic resonance frequency directed out of the coil plane and (ii) a sinusoidal electrical current distribution generating a second B1 field at a second magnetic resonance frequency directed parallel with the coil plane, wherein the second magnetic resonance frequency is higher than the first magnetic resonance frequency.
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2. A generally planar radio frequency coil comprising:
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one or two annular conductors arranged generally parallel with a coil plane of the generally planar radio frequency coil and configured to support (i) a uniform electrical current distribution generating a first B1 field at a first magnetic resonance frequency directed out of the coil plane and (ii) a sinusoidal electrical current distribution generating a second B1 field at a second magnetic resonance frequency directed parallel with the coil plane; and a generally planar radio frequency shield arranged parallel with the one or two annular conductors. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10)
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11. A radio frequency coil comprising:
an annular conductor configured to support; (i) a uniform electrical current distribution generating a first B1 field at a first magnetic resonance frequency directed out of a plane of the annular conductor, and (ii) a sinusoidal electrical current distribution generating a second B1 field at a second magnetic resonance frequency directed parallel with the plane of the annular conductor; wherein the second magnetic resonance frequency is higher than the first magnetic resonance frequency. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A magnetic resonance scanner comprising:
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a magnet generating a static magnetic field; a magnetic field gradient system configured to superimpose selected magnetic field gradients on the static magnetic field; and a single annular conductor configured to support both (i) a sinusoidal electrical current distribution generating or induced by a B1 field at a magnetic resonance frequency directed parallel with the plane of the annular conductor and (ii) a uniform electrical current distribution generating or induced by a B1 field at a magnetic resonance frequency directed out of a plane of the annular conductor. - View Dependent Claims (23)
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Specification