Key result
A novel MR tagging method combining 1D SPAMM and 2D cylindrical excitation successfully tracked blood motion and derived velocity spectra within a single heartbeat in phantom and human aorta models.
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A novel MR tagging method allows for fast measurements of blood motion and velocity spectrum within a single heartbeat.
A new method is presented for tracking the motion of blood and determining its velocity spectrum from magnetic resonance data collected within a single heartbeat. The method begins by tagging a column of blood in a vessel by combining a 1D SPAMM excitation with a 2D cylindrical excitation. A series of 1D projections of the tagging pattern is acquired from a train of gradient echoes. The influence of specific excitation profiles and velocity profiles on the motion of the tags is explored for steady flow. It is shown mathematically, and confirmed with phantom experiments, that the velocity of a tag equals the mean velocity of the excited fluid when the velocity spectrum is symmetric about its mean velocity. The velocity spectrum is derived by analyzing the interference between tags moving at different velocities. This appears to be the first use of magnitude tagging to obtain velocity spectra. Representative measurements in a human aorta are presented to assess feasibility in vivo. Magn Reson Med 45:461-469, 2001.
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Macgowan et al. (2001) studied this question. MR tagging (1D SPAMM with 2D cylindrical excitation) was evaluated on Tracking the motion of blood and determining its velocity spectrum. A novel MR tagging method combining 1D SPAMM and 2D cylindrical excitation successfully tracked blood motion and derived velocity spectra within a single heartbeat in phantom and human aorta models.
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