scholarly journals Direct Computation of Multiple 3D Flow Convergence isovelocity Surfaces from Digital 3D Reconstruction of Colour Doppler Data of the Flow Convergence Region: an in vitro Study with Differently Shaped Orifices

2000 ◽  
Vol 1 (4) ◽  
pp. 244-251 ◽  
Author(s):  
X Li
Keyword(s):  
3D Reconstruction ◽  
In Vitro Study ◽  
Vitro Study ◽  
Colour Doppler ◽  
3D Flow ◽  
Convergence Region ◽  
Direct Computation ◽  
Doppler Data ◽  
Flow Convergence

Effect of Physiological Factors on Proximal Flow Convergence Upstream of an Incompetent Valve: An In-Vitro Study

1997 ◽  
Vol 119 (1) ◽  
pp. 39-44 ◽  
Author(s):  
F. S. A. Guenet ◽  
P. G. Walker ◽  
M. W. Doyle ◽  
G. M. Pohost ◽  
A. P. Yoganathan
Keyword(s):  
Flat Plate ◽  
In Vitro Study ◽  
Vitro Study ◽  
Low Flow ◽  
Physiological Factors ◽  
Angle Correction ◽  
Flow Convergence ◽  
Flow Mri ◽  
Q 14

The flow (Q) through regurgitant valves may be quantified by multiplying the area of an isovelocity contour (isovel) by its velocity. This was tested computationally and experimentally (using MRI), Q = 14 to 141 ml/s, using flat and conical orifice plates. Plotting Q versus isovelocity radius, a plateau was found which, for low flow, corresponded to the true Q. At higher flow or large confinement, Q was overestimated. For conical plates, angle correction worked at low Q but not at higher values due to the formation of separation regions. These converted the cone plate into a flat plate. MRI produced similar results at 57 ml/s in that Q was correct with no angle correction. At low flow, MRI was too noisy to produce a clear plateau consistently.

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