VHF/RF volume antenna for magnetic resonance imaging including VHF applicator and RF coil arranged to provide perpendicular fields
First Claim
Patent Images
1. An OMRI volume transducer, comprising:
- a VHF applicator adapted for use at a frequency associated with an ESR signal; and
an RF coil disposed inside the applicator and adapted for use at a frequency associated with an MR signal, wherein the applicator and coil are arranged such that an electric field provided by the applicator in use is substantially perpendicular to the coil.
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Abstract
A transducer for Overhauser magnetic resonance imaging comprises a cylindrical NMR coil 11 and a two part VHF applicator 12, 13. The applicator and coil are arranged such that the electric field provided by the applicator in use is substantially perpendicular to the coil wires. The VHF applicator is shaped to give a helical field in the region filled by the RF coil, and the RF coil is arranged to be a helix of the opposite handedness. The applicator can comprise a number of similar elements having an electromagnetic resonance mode whose magnetic fled couple to the imaging volume. The elements can be arranged in spirals to form an electric periodic structure.
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Citations
20 Claims
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1. An OMRI volume transducer, comprising:
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a VHF applicator adapted for use at a frequency associated with an ESR signal; and an RF coil disposed inside the applicator and adapted for use at a frequency associated with an MR signal, wherein the applicator and coil are arranged such that an electric field provided by the applicator in use is substantially perpendicular to the coil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 20)
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9. An apparatus for Overhauser magnetic resonance imaging comprising:
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means for producing a constant magnetic field B in an imaging volume; means for producing a time varying gradient field in said imaging volume; means for transmitting signals into said imaging volume at a nuclear magnetic resonance (NMR) frequency, said NMR transmitting means including an RF volume coil adapted for use at an NMR frequency; means for transmitting signals into said imaging volume at an electron spin resonance (ESR) frequency, said ESR transmitting means including a VHF volume applicator adapted for use at an ESR frequency; means for operating the NMR transmitting means, the ESR transmitting means and the means for producing the gradient field to transmit the NMR and ESR signals and to vary the gradient field in said imaging volume; and means for receiving NMR signals from said imaging volume, wherein the VHF applicator and RF coil are arranged such that the electric field provided by the applicator in use is substantially perpendicular to the coil. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification