Electricity: measuring and testing – Particle precession resonance – Determine fluid flow rate
Patent
1983-11-15
1986-02-11
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Determine fluid flow rate
324309, G01R 3308
Patent
active
045701199
ABSTRACT:
A method for visualizing in-plane flow utilizing an NMR pulse sequence to produce a plurality of odd and even spin-echo signals occurring respectively at echo delay times, T.sub.E, of 2.tau., 6.tau., 10.tau., etc., and 4.tau., 8.tau., 12.tau., etc. In the preferred embodiment, a fictitious spin-echo amplitude is calculated from the odd and even spin-echo signals at an echo delay time T.sub.E =0, for example. The calculated values for the odd spin-echo signals are lower than those calculated for the even spin-echo signals due to incomplete rephasing of the odd spin-echo signals in the presence of a read-out magnetic field gradient and flow. Subtraction of the calculated image pixel value of the odd spin-echo signals from the calculated pixel values of the even spin-echo signals results in a difference image which highlights the flowing nuclear spins. The image pixels due to stationary nuclear spins experience exact cancellation.
REFERENCES:
patent: 4471306 (1984-09-01), Edelstein
patent: 4506222 (1985-03-01), Edelstein
patent: 4516075 (1985-05-01), Moran
MacFall James R.
Wehrli Felix W.
General Electric Company
Gerasimow Alexander M.
Stoner Douglas E.
Tokar Michael J.
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