Electricity: measuring and testing – Particle precession resonance – Determine fluid flow rate
Patent
1983-12-05
1986-11-04
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Particle precession resonance
Determine fluid flow rate
324307, G01V 300
Patent
active
046212345
ABSTRACT:
A method for measuring the velocity of a fluid in a conduit, for example, blood in a blood vessel, using pulsed nuclear magnetic resonance, in which velocity is derived from measuring the mean instantaneous frequency of FID or spin echo signals. A feedback loop is used to monitor the velocity of the fluid and to generate either FID or spin echo signals depending upon the fluid velocity and/or decay of the FID signal. Radio frequency pulses are applied to suitable static axial magnetic gradients to obtain flow measurement from within a specific volume.
REFERENCES:
patent: 2960650 (1960-11-01), Pinkley
patent: 3191119 (1965-06-01), Singer
patent: 3419793 (1965-04-01), Genthe et al.
patent: 3551794 (1968-02-01), Vander Heyden
patent: 3553728 (1971-01-01), Frank
patent: 3559044 (1971-01-01), Vander Heyden
patent: 3802263 (1974-04-01), Krechmery
patent: 4110680 (1978-08-01), Bergmann
patent: 4339716 (1982-07-01), Young
patent: 4520828 (1985-06-01), Burl
J. R. Singer "NMR Diffusion and Flow Measurements and an Introduction to Spin Phase Graphing", Journal of Phys. E: Sci. Instrument, vol. 11, (1978).
Grover, T. and J. R. Singer (1981), "NMR Spin-Echo Flow Measurements", J. Applied Phys., 42:938-940.
Singer, J. R. (1980), "Blood Flow Measurements by NMR of the Intact Body", IEEE Trans on Nuclear Science, 27:1245-1249.
Hemminga, M. A., P. A. de Jager and A. Sonneveld (1977), "The Study of Flow by Pulsed Nuclear Magnetic Resonance. I. Measurement of Flow Rates in the Presence of a Stationary Phase Using a Different Method", J. Magnetic Resonance, 27:359-370.
Garroway, A. N. (1974), "Velocity Measurements in Flowing Fluids by NMR", J. Physics D.: Applied Physics, 7:L159-L163.
Hemminga, M. A., P. A. de Jager (1980), "The Study of Flow by Pulsed Nuclear Magnetic Resonance. II. Measurement of Flow Velocities Using a Repetitive Pulse Method", J. Magnetic Resonance 37:1-16.
Eisenzopf Reinhard J.
Lovelace Medical Foundation
Peterkin G.
LandOfFree
Pulsed NMR flow measurement does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Pulsed NMR flow measurement, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pulsed NMR flow measurement will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-698509