Electricity: measuring and testing – Particle precession resonance – Determine fluid flow rate
Patent
1998-01-22
2000-03-28
Oda, Christine K.
Electricity: measuring and testing
Particle precession resonance
Determine fluid flow rate
324309, 324318, 600410, G01V 300
Patent
active
060436506
ABSTRACT:
There are provided body movement measuring means for measuring the movement of an object of inspection and control means for controlling at least means for applying a gradient magnetic field and means for applying a high frequency magnetic field. The control means performs a sequence for measuring an echo by applying a phase-encoding gradient magnetic field quantity a plurality of times with the same phase-encoding gradient magnetic field quantity and repeatedly executes the sequence while varying the phase-encoding gradient magnetic field quantity. When the phase-encoding gradient magnetic field quantity is small, the number of execution times of the sequence executed with the same phase-encoding gradient magnetic field quantity in a case where the phase-encoding gradient magnetic field quantity is small is set to be larger than a case where the phase encoding gradient magnetic field quantity is large to reduce the probability of omission occurrence of echo measurement in the small phase-encoding magnetic field which exerts a large influence on an image, thereby suppressing the occurrence of an artifact.
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"Retrospective Cardiac Gating: A Review of Technical Aspects and Future Directions", By Gerald Lenz, et al Magnetic Resonance Imaging. vol. 7.pp. 445-455, 1989.
Kawasaki Shinji
Okajima Ken'ichi
Taniguchi Yo
Hitachi , Ltd.
Oda Christine K.
Shrivastav Brij B.
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