Jeesoo Lee1, Liliana Ma1, Michael Baran Scott1, Alexander Jonathan Barker2, James David Thomas3, and Michael Markl1
1Radiology, Northwestern University, Chicago, IL, United States, 2Radiology, University of Colorado Denver Anschutz Medical Campus, Aurora, CO, United States, 3Cardiology, Northwestern University, Chicago, IL, United States
1Radiology, Northwestern University, Chicago, IL, United States, 2Radiology, University of Colorado Denver Anschutz Medical Campus, Aurora, CO, United States, 3Cardiology, Northwestern University, Chicago, IL, United States
Flow entrainment and momentum conservation in an MR-mimicking jet were demonstrated in-vitro using 4D flow MRI. We
found that jet flow volume may overestimate RVol due to flow entrainment
effect whereas axial jet momentum can be a reliable metric for MR flow characterization using 4D flow MRI.
Figure 3. Quantification results of flow and
momentum along the jet axis (voxel size 1.5 mm3 results) A: Flow rate waveform
vs. x [mm] along the jet (see Fig.1 for details). B: Flow momentum
waveform vs. x [mm] along the jet. C:
Total jet flow volume vs. x [mm] along the jet . The right vertical plot axis
indicates the error between RVol by 2D PC MRI. D: Momentum-Time-Integral
vs. x [mm] along the jet. Regression statistics were acquired for x = 5-50 mm.
Figure 5. Relative voxel size dependency of flow
quantification. A: Difference in flow volume compared to voxel size 1.5
mm results vs. number of voxels across the jet cross-section. B: MTI vs.
number of voxels across the jet cross-section. The jet diameter was derived by
computing the diameter of a circle with the area equivalent to the peak jet
area.
