Reduction of motion artifacts in nmr

Details Reduction of motion artifacts in nmr Reduction of motion artifacts in nmr

G - Physics

01

V

G01V 3/32 (2006.01)

Patent

CA 2565587

NMR spin echo signals, acquired on a MWD logging tool, are susceptible to errors if the magnet on the logging tool is moving relative to the earth magnetic flux density has a gradient. 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.

Des signaux d'écho de moment angulaire RMN, acquis sur un outil de diagraphie MWD, sont susceptibles d'erreur si l'aimant situé sur l'outil de diagraphie se déplace par rapport à la densité de flux magnétique terrestre. Les erreurs peuvent être corrigées si l'impulsion d'excitation couvre un volume plus important ou moins important que les impulsions de recentrage. Des corrections peuvent également être apportées par saturation sélective ou par établissement de la moyenne d'écho.

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