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Feasibility of k‐t BLAST technique for measuring “seven‐dimensional” fluid flow
Author(s) -
Marshall Ian
Publication year - 2006
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.20494
Subject(s) - undersampling , pulsatile flow , flow (mathematics) , data set , acceleration , data acquisition , resampling , physics , mathematics , computer science , mechanics , algorithm , medicine , statistics , artificial intelligence , cardiology , operating system , classical mechanics
Purpose To investigate the feasibility of rapid MR measurement of “seven‐dimensional” (three velocity components, three dimensions, and time) fluid flow using the k‐t Broad‐use Linear Acquisition Speed‐Up Technique (BLAST). Materials and Methods Complete k ‐space data were acquired for pulsatile fluid flow in a model of a stenosed carotid bifurcation. The data was subsampled to simulate “training” and “accelerated acquisition” data for reconstruction using k‐t BLAST. Results Flow waveforms estimated from k‐t BLAST reconstructions were in good agreement with those measured from the full data set for overall speedup factors up to approximately four times when slice‐by‐slice undersampling in k y was used. Accuracy was better than 25 mm/second or 7% (root‐mean‐square error) for individual time frames under these conditions. Flow patterns in the plane of symmetry, near the bifurcation, and in the stenosis were also in good agreement with those reconstructed from the full data set. Improved performance was obtained from undersampling in both k y and k z , when acceleration factors up to 12 times gave acceptable results. Conclusion The k‐t BLAST technique can be applied to flow quantification, and may make feasible the acquisition of time‐resolved blood flow from extended arterial regions within acceptable examination times. J. Magn. Reson. Imaging 2006. © 2006 Wiley‐Liss, Inc.