Ultrasound Doppler vector tomography measurements of directional blood flow.
An experimental system has been developed to verify the possibility of detecting flow activity using a technique called ultrasound Doppler vector tomography. A tomography algorithm is used to reconstruct blood flow vector fields using data from computer-controlled ultrasound continuous-wave Doppler scanning equipment. The result is a picture in which the brightness variations represent the reconstructed values of the curl of the velocity field (inverted delta x v). Continuous ultrasound is transmitted into a region with flow activity and the Doppler-shifted signals are received. To obtain measurement data suited for fan beam tomography, the scanning is performed in a plane from points encircling the region. Reconstructions have been achieved using measurement data from two different flow phantoms. A comparison between the experimental results and simulations shows good conformity.
Jansson
T
T
Department of Electrical Measurements, Lund Institute of Technology, Sweden.
Almqvist
M
M
Stråhlén
K
K
Eriksson
R
R
Sparr
G
G
Persson
H W
HW
Lindström
K
K
D001775:Blood Circulation / Q000502:physiology*; D008962:Models, Theoretical; D018608:Ultrasonography, Doppler / Q000379:methods*