Post-stenotic plug-like jet with a vortex ring demonstrated by 4D flow MRI
SCIE
SCOPUS
- Title
- Post-stenotic plug-like jet with a vortex ring demonstrated by 4D flow MRI
- Authors
- Kim, G.B; Ha, H; Kweon, J; Lee, S.J; Kim, Y.-H; Yang, D.H; Kim, N.
- Date Issued
- 2016-05
- Publisher
- ELSEVIER SCIENCE INC
- Abstract
- Purpose: To investigate the details of the flow structure of a plug-like jet that had a vortex ring in pulsatile stenotic phantoms using 4D flow MRI.
Method: Pulsatile Newtonian flows in two stenotic phantoms with 50% and 75% reductions in area were scanned by 4D flow MRI. Blood analog working fluid was circulated via the stenotic phantom using a pulsatile pump at a constant pulsating frequency of 1 Hz. The velocity and vorticity fields of the plug-like jet with a vortex ring were quantitatively analyzed in the spatial and temporal domains.
Results: Pulsatile stenotic flow showed a plug-like jet at the specific stenotic degree of 50% in our pulsatile waveform design. This plug-like jet was found at the decelerating period in the post-stenotic region of 26.4 mm (1.2 D). It revealed a vortex ring structure with vorticity strength in the range of +/- 100 s(-1).
Conclusion: We observed a plug-like jet with a vortex ring in pulsatile stenotic flow by in vitro visualization using 4D flow MRI. In this plug-like jet, the local fastest flow region occurred at the post-systole phase in the post-stenotic region, which was distinguishable from a typical stenotic jet flow at systole phase. (C) 2015 Elsevier Inc. All rights reserved.
- Keywords
- Pulsatile stenotic flow; Plug-like jet; Vortex ring; 4D flow MRI
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/37218
- DOI
- 10.1016/J.MRI.2015.11.010
- ISSN
- 0730-725X
- Article Type
- Article
- Citation
- MAGNETIC RESONANCE IMAGING, vol. 34, no. 4, page. 371 - 375, 2016-05
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