Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1995-05-30
1996-11-05
Arana, Louis M.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324322, G01V 300
Patent
active
055721311
ABSTRACT:
A unitary, generally cylindrical member supports both the primary and shielding coils. By supporting both coils on a unitary member it is possible to take advantage of the antiphase relationship between the primary and shielding coils and thereby reduce the acoustic noise generated by the gradient coil assembly. The unitary member can be formed by starting with a mandrel to which the primary coil is applied, and then successively adding layers each having a cylindrical outer surface aligned with the same longitudinal axis. Each new cylindrical surface is formed by adding material and then removing some of the material while rotating the member about the longitudinal axis (e.g., turning on a lathe, or passing a blade past a still liquid skim coat). Additional primary and shielding coils are applied after each new aligned, cylindrical surface is formed. One or more correction coils are located outside of the shielding coils to cancel any gradient field present there as the result of misalignment between the primary and shielding coils. Litz wire is used in the primary and shielding coils to reduce coil resistance.
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Mansfield, P. et al., "Multishield Active Magnetic Screening of Coil Structures in NMR," Journal of Magnetic Resonance, vol. 72, pp. 211-223 (1987) (month of pub. unknown).
Turner, R. et al., "Passive Screening of Switched Magnetic Field Gradients," The Institute of Physics, pp. 876-879 (1986) (month of pub. unknown).
Advanced NMR Systems, Inc.
Arana Louis M.
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