Nuclear magnetic resonance apparatus having semitoroidal rf coil for use in topical NMR and NMR imaging
First Claim
1. In a nuclear magnetic resonance (NMR) spectrometer, the improvement comprising a semitoroidal primary radio-frequency (rf) coil for irradiating a sample with an alternating magnetic field.
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Accused Products
Abstract
An improved nuclear magnetic resonance (NMR) apparatus for use in topical magnetic resonance (TMR) spectroscopy and other remote sensing NMR applications includes a semitoroidal radio-frequency (rf) coil. The semitoroidal rf coil produces an effective alternating magnetic field at a distance from the poles of the coil, so as to enable NMR measurements to be taken from selected regions inside an object, particularly including human and other living subjects. The semitoroidal rf coil is relatively insensitive to magnetic interference from metallic objects located behind the coil, thereby rendering the coil particularly suited for use in both conventional and superconducting NMR magnets. The semitoroidal NMR coil can be constructed so that it emits little or no excess rf electric field associated with the rf magnetic field, thus avoiding adverse effects due to dielectric heating of the sample or to any other interaction of the electric field with the sample.
57 Citations
19 Claims
- 1. In a nuclear magnetic resonance (NMR) spectrometer, the improvement comprising a semitoroidal primary radio-frequency (rf) coil for irradiating a sample with an alternating magnetic field.
- 10. In a nuclear magnetic resonance (NMR) spectrometer, the improvement comprising a semitoroidal decoupling radio-frequency (rf) coil for irradiating a sample with an alternating magnetic field.
- 15. A nuclear magnetic resonance (NMR) apparatus comprising a magnet for generating a substantially homogenous static magnetic field, and a semitoroidal radio-frequency (rf) primary coil for irradiating a sample positioned in said static magnetic field with an alternating magnetic field.
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