Feasibility of k-t BLAST technique for measuring “seven-dimensional” fluid flow

✍ Scribed by Ian Marshall

• Book ID: 102904501
• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 732 KB
• Volume: 23
• Category: Article
• ISSN: 1053-1807
• DOI: 10.1002/jmri.20494

✦ Synopsis

Abstract

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.