Spatial Profile of Blood Velocity Reconstructed from Telemetered Sonogram in Exercising Man

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概要

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• A continuous-wave ultrasonic Doppler system using wide field ultrasound transducers was applied to telemeter blood velocity from the carotid artery of exercising subjects. Velocity spectrogram was obtained by Hanning windowed fast Fourier transformation of the telemetered data. Distortion caused by a high-pass filter and transducers in the telemetry system was discussed in the paper. As the maximum Reynolds number in our experiment was 1478 which is smaller than the critical level of 2000, the blood flow should be laminar. Spatial velocity profiles were then reconstructed from the velocity spectrogram. In this paper, we defined a converging index Q of the velocity spectrum to measure the bluntness of the spatial velocity distribution across the blood vessel. Greater Q, the blunter the velocity profile will be. Simulation results for spatial velocity distributions of theoretical parabolic flow and Gaussian-distribution spectra with varied Q value showed that the cut-off effect by a high-pass filter of cut-off frequency f_c =200 Hz in our system could be ignored when the axial velocity is larger than 0.30 m/s and Q is greater than 2.0. Our experimental results, in contrast to those obtained from phantom systems by us and by Hein and O'Brien, indicate that the distribution of blood velocity is much blunter than previously thought. The Q index exceeded 10 during systole, whereas it was 0.5 in parabolic flow. The peak of Q index lagged behind that of axial blood velocity by approximately 0.02 s. The phase delay of the Q index curve might be due to the time needed for the red blood cells to form the nonhomogeneous distribution.

• 社団法人電子情報通信学会の論文
• 1995-12-25

著者

• He Jufang

  Department of Physiology, School of Medicine. The University of Tokushima.

• Yamaguchi Hisao

  Department of Physiology, School of Medicine. The University of Tokushima.

• Kinouchi Yohsuke

  Department of Electrical and Electronic Engineering, Faculty of Engineering. Technical College, The

• Yamaguchi Hisao

  Electronic And Mechanical Sec. Tokushima Pref. I. T. C.

• MIYAMOTO HIROSHI

  Dept. of Physiology, The University of Tokushima

• Kinouchi Yohsuke

  Dept. of Electric and Electronic Eng., The University of Tokushima

• He Jufang

  Depertment of Electrical and Electronic Engineering, The University of Tokushima

• Miyamoto Hiroshi

  Faculty of Domestic Science, Tokushima Bunri University

• Kinouchi Y

  Dept. Of Electric And Electronic Eng. The University Of Tokushima

• He J

  Depertment Of Electrical And Electronic Engineering The University Of Tokushima

• Yamaguchi H

  Ritsumeikan Univ.

• Kinouchi Yohsuke

  Depertment Of Electrical And Electronic Engineering The University Of Tokushima

• Kinouchi Yohsuke

  Dept. Of Electric And Electronic Eng. The University Of Tokushima

• Miyamoto H

  Dept. Of Physiology The University Of Tokushima

• Hirao Yoji

  Dept. Of Electric And Electronic Eng. The University Of Tokushima:electronic And Mechanical Sec. Tok

• Kinouchi Yohsuke

  Department Of Electrical And Electronic Engineering Institute Of Socio- Techno Sciences University O

• Miyamoto Hiroshi

  Faculty Of Biology-oriented Science And Technology Department Of Molecular Genetics Kinki University

• Kinouchi Yohsuke

  Faculty Of Engineering Department Of Electrical And Electronic Engineering The University Of Tokushi

• He Jufang

  Department of Clinical Laboratory, 309th Hospital of Chinese People's Liberation Army

• YAMAGUCHI HISAO

  Department of Pathology, School of Medicine, Keio University

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