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MR imaging of poststenotic flow phenomena: Experimental studies
Author(s) -
Krug Barbara,
Kugel Harald,
Friedmann Gerd,
Bunke Juergen,
van Dijk Peter,
Schmidt Rainer,
Hirche Hans Juergen
Publication year - 1991
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.1880010512
Subject(s) - imaging phantom , nuclear magnetic resonance , materials science , amplitude , flow (mathematics) , stenosis , magnetic resonance imaging , spin echo , turbulence , physics , optics , radiology , medicine , mechanics
Poststenotic flow patterns were analyzed in a flow phantom with a 1.5‐T magnetic resonance (MR) imager, with use of different MR imaging and MR angiographic pulse sequences. Spin‐echo, fast field‐echo, two‐dimensional inflow (multiple single‐section technique), and flow‐adjusted‐gradient sequences were applied. For the spin‐echo sequences, modulus and phase images were reconstructed from each data set. The length of the region of poststenotic changes in signal amplitude and phase measured at a constant flow rate increased with stenosis grade. Likewise, the length of the region of poststenotic changes measured at a constant stenosis grade increased with flow rate. Moreover, the results depended on the alignment of the flow direction with the readout gradient. Comparison of modulus and phase images allowed discrimination of turbulent and nonturbulent flow, which yields additional information on stenosis grade in clinical MR angiography.