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Ultrasonic observation of blood disturbance in a stenosed tube: effects of flow acceleration and turbulence downstream
- Source :
- Ultrasound in medicinebiology. 34(1)
- Publication Year :
- 2006
-
Abstract
- Red blood cell (RBC) aggregation is known to be highly dependent on hemodynamic parameters such as shear rate, flow turbulence and flow acceleration under pulsatile flow. The effects of all three hemodynamic parameters on RBC aggregation and echogenicity of porcine whole blood were investigated downstream of an eccentric stenosis in a mock flow loop using B-mode images with Doppler spectrograms of a commercial ultrasonic system. A hyperechoic parabolic profile appeared downstream during flow acceleration, yielding another piece of evidence suggesting that the enhancement of rouleaux formation may be caused by flow acceleration. It was also found that echogenicity increased locally at a distance of three tube diameters downstream from the stenosis. The local increase of echogenicity is thought to be mainly due to flow turbulence. The hypoechoic “black hole” was also seen at the center of the tube downstream of the stenosis where blood flow was disturbed, and this may be caused by the compound effect of flow turbulence and shear rate. (E-mail: paeng@cheju.ac.kr )
- Subjects :
- Rouleaux
Erythrocyte Aggregation
Materials science
Acoustics and Ultrasonics
Flow (psychology)
Acceleration
Sus scrofa
Biophysics
Pulsatile flow
Hemodynamics
Arterial Occlusive Diseases
Optics
Animals
Radiology, Nuclear Medicine and imaging
Ultrasonography
Radiological and Ultrasound Technology
business.industry
Turbulence
Models, Cardiovascular
Echogenicity
Mechanics
Blood flow
Shear rate
Pulsatile Flow
Hemorheology
business
Blood Flow Velocity
Subjects
Details
- ISSN :
- 03015629
- Volume :
- 34
- Issue :
- 1
- Database :
- OpenAIRE
- Journal :
- Ultrasound in medicinebiology
- Accession number :
- edsair.doi.dedup.....1abc67911db59b9abff4c54f01050dab