NMR multiple-echo phase-contrast blood flow imaging

Details NMR multiple-echo phase-contrast blood flow imaging NMR multiple-echo phase-contrast blood flow imaging

1984-08-10

1986-09-02

Levy, Stewart J.

Electricity: measuring and testing

Particle precession resonance

Determine fluid flow rate

324309, G01R 3320

Patent

active

046098720

ABSTRACT:
A method for magnetic resonance imaging of fluid flow, and particularly in vivo blood flow, uses multiple-echo phase-contrast sequences of signals both in the magnetic field gradient in the direction in which fluid flow is to be determined, and in the radio-frequency (RF) magnetic field utilized with the magnetic field gradient. The magnetic field gradient has a pair of phase-encoding pulses having a zero mean value effect upon the sample, either alone or with inversion by an intermediate 180.degree. RF pulse signal. A first multi-echo sequence, provided with the phase-encoding pulse pair, provides information of both the amplitude and phase-shift of each pixel of the imaged flowing material while a second multiple echo sequence, devoid of the phase-encoding-gradient pulses, provides information as to the amplitude and the undesired initial phase-shift of each pixel of both stationary and flowing material. Information provided responsive to the second sequence is subtracted from the information provided responsive to the first sequence to provide an image having an intermediate grey-scale value for stationary sample material and with differential grey-scale encoding for differential flow velocities of fluid passing through the image plane.

REFERENCES:
patent: 4574239 (1986-03-01), Singer
Singer, J. R., "NMR Diffusion and Flow Measurements and an Introduction to Spin Phase Graphing", J. of Physics E: Scientific Instruments, vol. 11, 1978, pp. 281-291.

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