Flow measurement of incompressible fluid using divergence-free c

Details Flow measurement of incompressible fluid using divergence-free c Flow measurement of incompressible fluid using divergence-free c

1992-10-30

1994-05-03

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Determine fluid flow rate

G01R 3320

Patent

active

053091000

ABSTRACT:
A method and apparatus to reduce the noise in three-dimensional phase contrast magnetic resonance velocity measurements exploits the property that blood is incompressible and therefore the velocity field describing its flow must be divergence-free. The divergence-free condition can be incorporated by the projection operation on Hilbert space where the velocity measurements are projected onto the space of divergence-free velocity fields. The reduction of noise is achieved since the projection operation eliminates the noise component that is not divergence-free. Higher quality angiograms are produced due to the noise reduction in the velocity measurement signals.

REFERENCES:
patent: 4862080 (1989-08-01), Hendrik Van as
Song, "Improvement of Vessel Conspicuity of 3D Phase Contrast MRI by Application of a Divergence-free Constraint," Scty. of Mag. Res. in Med., 11th Ann. Sci. Mtg., Berlin, Aug. 8-14, 1992.
Dumoulin, "Quantitative Measurement of Blood Flow Using Cylindrically Localized Fourier Velocity Encoding," Mag. Res. in Med., vol. 21, pp. 242-250, 1991 (no month).
Walton, "Flow Velocity Measurement with ac Gradients," Mag. Res. in Med., vol. 4, pp. 274-281, 1987 (no month).
Hu, "Localized Real-Time Velocity Spectra," Aug. 10, 1991, p. 1158 (no month).
Pearlman, "Real-Time MR Beam-directed Velocity Mapping: V-Mode MR Imaging," J. Mag. Res. Img., Mar./Apr. 1991, p. 154.
Dumoulin, "Three-Dimensional Phase Contrast Angiography," Mag. Res. in Med., vol. 9, pp. 139-149, 1989 (no month).
Brown, "Contrast-to-Noise Ratios in Maximum Intensity Projection Images," Mag. Res. in Med., vol. 23, pp. 130-137, 1992 (no month).
Song, "Computation of 3-D Velocity Fields from 3-D Cine CT Images of a Human Heart," IEEE Trans. on Med. Img., vol. 10, No. 3, Sep. 1991, pp. 295-306.
Girault, Finite Element Methods for Navier-Stokes Equations, Published by Springer-Verlag, pp. 1-57 (Mar. 1986).
Simard, "A Projection Operator for the Restoration of Divergence-Free Vector Fields," IEEE Trans. on Pattern Analysis and Machine Intell., vol. 10, No. 2, Mar. 1988.
Pelc, "Encoding Strategies for Three-Direction Phase-Contrast MR Imaging of Flow," Jrnl. Med. Res. Img., Jul./Aug. 1991, pp. 405-413.

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