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Detection and measurement of motion during NMR imaging using orbital navigator echo signals

  • US 5,539,312 A
  • Filed: 02/02/1995
  • Issued: 07/23/1996
  • Est. Priority Date: 02/02/1995
  • Status: Expired due to Term
First Claim
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1. A method for detecting in-plane movement of a subject during a scan in which an NMR image data set is acquired, the steps comprising:

  • acquiring the NMR data set using a series of NMR imaging pulse sequences;

    interleaving with the series of NMR imaging pulse sequences a series of NMR navigator signal pulse sequences, each navigator signal pulse sequence including the application of two in-plane, orthogonal magnetic field gradients during the readout of its navigator signal such that a resulting navigator signal samples a substantially circular path in k-space;

    acquiring the navigator signals during the scan; and

    analyzing the acquired navigator signals to measure in-plane motion of the subject during the scan.

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