Flow imaging in an end-to-side anastomosis model using two-dimensional velocity vectors.
Colour flow Doppler ultrasound images from vessels of complex geometry can be difficult to interpret, thereby limiting the effectiveness of the technique to correctly assess abnormalities and to relate the images to the underlying flow field in a quantitative manner. This paper describes progress in calculating and displaying two-dimensional (2-D) velocity vectors from a 30 degrees end-to-side anastomosis model under steady flow conditions at various Reynolds numbers. Velocity vectors were computed from colour Doppler ultrasound images obtained with a linear array for several incident beam directions, and the results were displayed either as colour-encoded magnitude images or by superimposing the vectors on one of the original colour images. Results are discussed in relation to flow visualization observations and the behaviour of flow in curved vessels.
Maniatis
T A
TA
Institute of Biomedical Engineering, University of Toronto, Canada.
Cobbold
R S
RS
Johnston
K W
KW
D000714:Anastomosis, Surgical; D001783:Blood Flow Velocity; D006083:Graft Occlusion, Vascular / Q000000981:diagnostic imaging*; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008955:Models, Cardiovascular; D008961:Models, Structural; D018615:Ultrasonography, Doppler, Color / Q000379:methods*