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Post-stenotic plug-like jet with a vortex ring demonstrated by 4D flow MRI.
- Source :
-
Magnetic Resonance Imaging (0730725X) . May2016, Vol. 34 Issue 4, p371-375. 5p. - Publication Year :
- 2016
-
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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0730725X
- Volume :
- 34
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- Magnetic Resonance Imaging (0730725X)
- Publication Type :
- Academic Journal
- Accession number :
- 113826999
- Full Text :
- https://doi.org/10.1016/j.mri.2015.11.010