Method for obtaining data in phase-contrast MR angiography

Details Method for obtaining data in phase-contrast MR angiography Method for obtaining data in phase-contrast MR angiography

1991-10-23

1993-04-27

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Determine fluid flow rate

G01R 3320

Patent

active

052065910

ABSTRACT:
For obtaining data in phase contrast MR angiography, which data is sensitive to flow in a sample in three-orthogonal directions, a sequence with four steps is applied to a sample. In the first step, spins are flow encoded with a positive polarity in all three directions. During the three further steps, flow encoding is inverted in one direction and kept positive in all other directions, with the direction having the inverted polarity being different in all three of the further steps. A raw data set for each of the directions is obtained by complex subtraction of the signals obtained by one of the further steps and of the signals obtained by the first step.

REFERENCES:
patent: 5070876 (1991-12-01), Wright
patent: 5133357 (1992-07-01), Dumoulin et al.

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