Electricity: measuring and testing – Particle precession resonance – Determine fluid flow rate
Patent
1996-09-24
1998-06-30
Arana, Louis M.
Electricity: measuring and testing
Particle precession resonance
Determine fluid flow rate
324307, G01V 300
Patent
active
057739757
ABSTRACT:
A method of determining a velocity of moving matter by magnetic resonance, includes a application of a phase contrast method in at least one measuring direction so as to determine a velocity. Upon determination of the velocity by means of phase contrast MRA, the cyclic nature of the phase introduces an ambiguity in the velocity determination. This ambiguity is removed by performing an additional measurement in an additional direction and by combining the velocity measured in the additional direction with the previously determined velocity. It has also been found that there is an optimum direction for this additional measurement. The advantage of the method of the invention is that the velocities can be determined and corrected in the three basic directions. As a result, low flow velocities can be determined and corrected in the three basic directions. As a result, low flow velocities can be measured, so that slow liquid flows in small blood vessels can be made visible in an MR image.
REFERENCES:
patent: Re32701 (1988-06-01), Moran
patent: 5025788 (1991-06-01), Dumoulin
patent: 5352980 (1994-10-01), Machida
"Dual Velocity Sensitive Tetrahedral Flor Encoding MR Angiography", by Y. Machida, et al, Proceedings of the SMRM 1992, 2810.
De Becker Jan F. L.
Fuderer Miha
Hoogenboom Thomas L. M.
Arana Louis M.
Slobod Jack D.
U.S. Philips Corporation
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