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NMR scanner with motion zeugmatography

  • US RE32,701 E
  • Filed: 04/08/1987
  • Issued: 06/21/1988
  • Est. Priority Date: 01/04/1983
  • Status: Expired due to Term
First Claim
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1. In a gyromagnetic resonance instrument .Iadd.for producing an image of an extended subject which contains both stationary gyromagnetic material and moving gyromagnetic material, in .Iaddend.which .Iadd.the instrument .Iaddend.performs a measurement cycle by applying a transverse excitation signal to a gyromagnetic material and to thereby impart a transverse magnetic moment thereto, and which produces a FID signal responsive to emissions by the transversely magnetized gyromagnetic material, the improvement comprising:

  • .Iadd.means for locating the position of the gyromagnetic material within the extended subject which is producing a FID signal;

    .Iaddend.means for motion sensitizing a FID signal in which a motion sensitizing magnetic field gradient F is applied to the gyromagnetic material for a period of time 2T after its transverse excitation and prior to the production of the FID signal, and wherein the motion sensitizing magnetic field gradient F has alternating polarity with respect to the gyromagnetic material such that its integral over the time period 2T is substantially zero; and

    detector means for receiving the FID signal and producing therefrom a signal S1 (t) which is phase-referenced to the cosine phase of the transverse excitation signal and a signal S2 (t) which is phase-referenced to the sine phase of the transverse excitation signal.

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