Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1996-04-24
1998-10-06
Arana, Louis M.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324307, G01V 300
Patent
active
058182292
ABSTRACT:
There is a method of correcting an imaging pulse sequence magnetically applied by an imaging scan to an object. The method comprises a step of performing a first prescan to the object with a first preliminary pulse sequence including an RF excitation pulse and a plurality of RF refocusing pulses each having an application phase set to a specified phase value (for example, 90.degree.) and a step of performing a second prescan to the object with a second preliminary pulse sequence including an RF excitation pulse and a plurality of RF refocusing pulses of which even-numbered RF refocusing pulse has an application phase set to another specified phase value (for example, 270.degree.) differed by 180.degree. from the specified phase value. The method further comprises a step of correcting the imaging pulse sequence on the basis of first and second echo data groups provided by the first and second prescan, prior to the imaging scan. Each of the first and second preliminary pulse sequences and the imaging pulse sequence is formed by a CPMG pulse train or a phase reversal CP pulse train, such as a GRASE sequence and a fast SE sequence.
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Arana Louis M.
Kabushiki Kaisha Toshiba
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