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Quantitative measurement of velocity at multiple positions using comb excitation and fourier velocity encoding

 

作者: C. L. Dumoulin,   D. J. Doorly,   C. G. Caro,  

 

期刊: Magnetic Resonance in Medicine  (WILEY Available online 1993)
卷期: Volume 29, issue 1  

页码: 44-52

 

ISSN:0740-3194

 

年代: 1993

 

DOI:10.1002/mrm.1910290110

 

出版商: Wiley Subscription Services, Inc., A Wiley Company

 

数据来源: WILEY

 

摘要:

AbstractAn MR imaging technique that simultaneously acquires Fourier velocity encoded data from multiple stations is described. The technique employs a comb excitation rf pulse that excites an arbitrary number of slices. As the Fourier velocity phase encoding gradient pulse is advanced, the phase of each slice is the comb is advanced by a unique amount. This causes the signals from the spins in a particular slice to appear at a position in the phase encoding direction, which is the sum of the spin velocity and an offset arising from the phase increment given to that excitation slice. Acquisition of spin velocity information occurs simultaneously for all slices, permitting the calculation of wave velocities arising from pulsatile flow. These wave velocities can then be used to determine vessel distensibility.

 

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