NMR machine with low field and dynamic polarization
Patent 5208533 Issued on May 4, 1993. Estimated Expiration Date: 
March 29, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 29, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesMethods and apparatus for detecting certain compounds Pulsed field MRI system with non-resonant excitation Patent #: 5057776 InventorAssigneeApplicationNo. 671696 filed on 03/29/1991US Classes:324/307, Using a nuclear resonance spectrometer system324/309To obtain localized resonance within a sampleExaminersPrimary: Arana, LouisAttorney, Agent or FirmForeign Patent References
International ClassG01V 003/00Foreign Application Priority Data1988-09-30 FRAbstractProblems of homogeneity of the resonant field of an NMR machine are solved by differentiating the polarization and resonance functions assigned to coils of the field of said machine. In order to produce a magnetization, use is made of a polarization coil which produces a high field. This polarization field does not need to be homogeneous. Before making measurements, during sequences of excitation-measurement of the electromagnetic wave within the body under examination, the polarization field is switched in order to be cancelled and the body is subjected to a resonance field. This resonance field can be of much lower strength but is on the other hand much more homogeneous. By thus making use of switching of the orienting field, it is shown that the signal-to-noise ratio of the detected signal is maintained.Other References
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