Reduction of motion artifacts in NMR

Details Reduction of motion artifacts in NMR Reduction of motion artifacts in NMR

2007-02-20

2007-02-20

Gutierrez, Diego (Department: 2859)

Electricity: measuring and testing

Particle precession resonance

Using well logging device

Reexamination Certificate

active

10839478

ABSTRACT:
NMR spin echo signals, acquired on a MWD logging tool, are susceptible to errors magnetic flux density has a gradient and the magnet on the logging tool is moving relative to the earth. The errors can be corrected by having the excitation pulse cover a smaller or a larger volume than the refocusing pulses. Correction may also be made by selective saturation, or by echo averaging.

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