In vivo ultrasonic measurement of tissue vibration at a stenosis: a case study
It is known that bruits often can be heard downstream from stenoses. They are thought to be produced by disturbed blood flow and vessel wall vibrations. Our understanding of bruits has been limited, though, to analysis of sounds heard at the level of the skin. For direct measurements from the stenos...
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| Veröffentlicht in: | Ultrasound in medicine & biology 2001-08, Vol.27 (8), p.1049-1058 |
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| container_title | Ultrasound in medicine & biology |
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| creator | Plett, Melani I Beach, Kirk W Dunmire, Barbrina Brown, Katherine G Primozich, Jean F Strandness, E |
| description | It is known that bruits often can be heard downstream from stenoses. They are thought to be produced by disturbed blood flow and vessel wall vibrations. Our understanding of bruits has been limited, though, to analysis of sounds heard at the level of the skin. For direct measurements from the stenosis site, we developed an ultrasonic pulse-echo multigate system using quadrature phase demodulation. The system simultaneously measures tissue displacements and blood velocities at multiple depths. This paper presents a case study of a severe stenosis in a human infrainguinal vein bypass graft. During systole, nearly sinusoidal vessel wall vibrations were detected. Solid tissue vibration amplitudes measured up to 2 μm, with temporal durations of 100 ms and frequencies of roughly 145 Hz and its harmonics. Cross-axial oscillations were also found in the lumen that correlate with the wall vibrations, suggesting coupling between wall vibration and blood velocity oscillation. (E-mail: mplett@spu.edu) |
| doi_str_mv | 10.1016/S0301-5629(01)00408-2 |
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They are thought to be produced by disturbed blood flow and vessel wall vibrations. Our understanding of bruits has been limited, though, to analysis of sounds heard at the level of the skin. For direct measurements from the stenosis site, we developed an ultrasonic pulse-echo multigate system using quadrature phase demodulation. The system simultaneously measures tissue displacements and blood velocities at multiple depths. This paper presents a case study of a severe stenosis in a human infrainguinal vein bypass graft. During systole, nearly sinusoidal vessel wall vibrations were detected. Solid tissue vibration amplitudes measured up to 2 μm, with temporal durations of 100 ms and frequencies of roughly 145 Hz and its harmonics. Cross-axial oscillations were also found in the lumen that correlate with the wall vibrations, suggesting coupling between wall vibration and blood velocity oscillation. 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They are thought to be produced by disturbed blood flow and vessel wall vibrations. Our understanding of bruits has been limited, though, to analysis of sounds heard at the level of the skin. For direct measurements from the stenosis site, we developed an ultrasonic pulse-echo multigate system using quadrature phase demodulation. The system simultaneously measures tissue displacements and blood velocities at multiple depths. This paper presents a case study of a severe stenosis in a human infrainguinal vein bypass graft. During systole, nearly sinusoidal vessel wall vibrations were detected. Solid tissue vibration amplitudes measured up to 2 μm, with temporal durations of 100 ms and frequencies of roughly 145 Hz and its harmonics. Cross-axial oscillations were also found in the lumen that correlate with the wall vibrations, suggesting coupling between wall vibration and blood velocity oscillation. 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| source | MEDLINE; Elsevier ScienceDirect Journals Complete |
| subjects | Biological and medical sciences Blood Flow Velocity Bruit Cardiovascular system Constriction, Pathologic - diagnostic imaging Displacement measurement Graft Occlusion, Vascular - diagnostic imaging Humans Investigative techniques, diagnostic techniques (general aspects) Medical sciences Peripheral Vascular Diseases - diagnostic imaging Quadrature demodulation Stenosis Ultrasonic investigative techniques Ultrasonography Ultrasound Vibration Wall motion |
| title | In vivo ultrasonic measurement of tissue vibration at a stenosis: a case study |
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