Flow velocity calculating method in magnetic resonance imaging a

Details Flow velocity calculating method in magnetic resonance imaging a Flow velocity calculating method in magnetic resonance imaging a

1997-02-10

1999-07-27

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Determine fluid flow rate

324307, G01V 300

Patent

active

059296372

ABSTRACT:
The present invention intends to easily perform arithmetic operations for determining flow velocities without making phase correction and to reduce the aliasing error. To this end, a plurality of data pieces having phase sensitivity are measured using phase contrast pulse sequences in a magnetic resonance diagnostic apparatus. When four data pieces having phase sensitivity of tetrahedral type are acquired, four measured images are obtained. Individual measured images have vector values at corresponding points. Predetermined pair images are subjected to an arithmetic operation for determining an angle between two vectors at individual points on the images, the thus obtained phase images are added and a sum image is multiplied by a suitable coefficient to produce an x-direction flow velocity image. Flow velocity images in y and z directions are similarly obtained and images determining the magnitudes of flow velocities can also be produced.

REFERENCES:
patent: 5352980 (1994-10-01), Machida
patent: 5408180 (1995-04-01), Mistretta et al.
patent: 5773975 (1998-06-01), De Becker et al.
"Three-Dimensional Phase Contrast Agiography", Magnetic Resonance in Medicine, vol. 9, pp. 139-149 (1989).
"Dual Velocity Sensitive Tetrahedral Flow Encoding MR Angiography", SMRM (1992), p. 2810.
"Quantitative Flow Measurement in Phase Contrast MR Angiography", Journal of Computer Assisted Tomography, vol. 12(2), pp. 304-313.
"Image Reconstruction from Half of the Data Using a Phase Map", Sixth SMRM(1987), p. 809.

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