Detection and measurement of motion during NMR imaging using orbital navigator echo signals
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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Abstract
An NMR image data set is acquired along with interleaved navigator signals. The navigator signals are acquired while two, orthogonal readout gradients are applied such that a circular orbit in k-space is sampled. The navigator signals are analyzed to detect object motion and to produce corrective values for the NMR image data to reduce artifacts caused by object rotation and displacement along two axes.
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Citations
7 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Current AssigneeMayo Foundation For Medical Education And Research (Mayo Clinic)
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Original AssigneeMayo Foundation For Medical Education And Research (Mayo Clinic)
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InventorsFu, Zhuo F., Ehman, Richard L.
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Primary Examiner(s)O'Shea, Sandra L.
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Assistant Examiner(s)MAH, RAYMOND
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Application NumberUS08/382,711Time in Patent Office537 DaysField of Search324/309, 324/307, 324/300, 324/314, 324/312, 128/653.2, 128/653.5US Class Current324/309CPC Class CodesG01R 33/56509 due to motion, displacement...
