Nuclear magnetic resonance systems
Patent 4449097 Issued on May 15, 1984. Estimated Expiration Date: 
July 15, 2001. 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.
July 15, 2001. 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 ReferencesAnalysis of materials Nuclear magnetic resonance systems Patent #: 4339716 InventorsAssigneeApplicationNo. 06/283635 filed on 07/15/1981US Classes:324/309, To obtain localized resonance within a sample324/318Spectrometer componentsExaminersPrimary: Tokar, MichaelAttorney, Agent or FirmInternational ClassesG01R 33/483 (20060101)G01R 33/48 (20060101) Foreign Application Priority Data1980-08-06 GBAbstractNuclear magnetic resonance methods have been proposed for examination of large bodies, including medical examination of patients. These include so-called steady state free precession methods. Such methods involve alternating excitation of a region of the body in such a way that an equilibrium condition is established at which a mean resonance signal is detectable. Typically for excitation of a planar region a radio frequency excitation field is provided in the presence of a field having an alternating gradient so that equilibrium is only reached in the plane. It is now proposed to achieve the same result by the application of two radio frequency fields having opposing gradients and pulsed in alternation to balance substantially only in the plane and provide equilibrium only there. The fields are provided by respective sets of saddle shaped coils divided into pairs of unequal dimension (1a, 1b, 2a, 2b) to provide the respective gradients.Other References
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