Electricity: measuring and testing – Particle precession resonance – Determine fluid flow rate
Patent
1997-08-22
1998-05-26
Arana, Louis M.
Electricity: measuring and testing
Particle precession resonance
Determine fluid flow rate
324318, G01V 300
Patent
active
057571872
ABSTRACT:
Weak oscillating gradients are used to modulate the angular momentum of the spins in a magnetic resonance imaging apparatus producing output signals in the receiver coil which can be synchronously demodulated to yield a periodic envelope containing integral harmonics of the oscillating gradient frequency. This periodic envelope is subjected to synchronous detection, continuously yielding the amplitudes of the individual harmonic components of the envelope which are then used to approximate an integral equation by a matrix solution to a linear transformation which generates the Radon transform of the transverse magnetization along the direction of the oscillating gradient, permitting image reconstruction. Truncation (Gibbs) artefacts are eliminated. Synchronous demodulation and synchronous detection of the impulse spectrum of the output signal from the receiver coil suppresses the continuous spectrum Johnson noise. The very weak higher harmonics are synchronously detected over multiple periods yielding an improved estimate of their central tendency.
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Arana Louis M.
Wollin Ventures, Inc.
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