Method for obtaining data in phase-contrast MR angiography
AssigneeSiemens Aktiengesellschaft
InventorsRichard Hausmann, Gerhard Laub
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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.
Claims7
A method for obtaining data for phase-contrast MR angiography, which method is sensitive to flow in a sample in three orthogonal directions, comprising:
- a sequence with four steps:
- a first step comprising excitation of spins in said sample and flow encoding said spins in a positive direction;
- three further steps whereby in each further step flow encoding of said spins is inverted in one of said orthogonal directions and positive in the other two directions, and said one direction is a different one of said three directions in each of said three further steps;
- sampling the signals obtained during each of said above four steps;
- and
- obtaining a raw data set for each of said orthogonal directions by complex subtraction of the signals obtained by one of said further steps and of the signals obtained by said first step.
Dependencies are inferred from the claim text.