期刊
ULTRASOUND IN MEDICINE AND BIOLOGY
卷 30, 期 5, 页码 639-645出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.ultrasmedbio.2004.02.006
关键词
fluid dynamics; hemodynamics; blood flow velocity; curved vessels.
Blood vessel curvature is responsible for the appearance of nonaxial velocity components and for minor changes in the pattern of the axial flow. All the velocity components are expected to contribute to the Doppler signal produced by the ultrasound (US) backscattered by the insonated blood cells, the axial velocity, contributing to the actual volumetric blood flow, and the transverse velocity, causing the recirculating vortices. A detailed, separate analysis of the velocity components is, therefore, mandatory to quantify how vessel curvature can affect results and clinical diagnosis. Both experimental in vitro measures and numerical simulations were performed on a curved tube and the Doppler power spectra so obtained were compared. The satisfactorily agreement of the above spectra shows that the nonaxial velocity components are easily detectable with clinical equipment and that their amplitude, as expected, is not negligible and can bias Doppler measurements and resulting clinical diagnosis. (E-mail: caterina.guiot@unito.it) (C) 2004 World Federation for Ultrasound in Medicine Biology.
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