Velocity of ultrasound,acoustic impedance and reflectivity. measured on arterial walls.

1 Citations
  • Arai Tsutomu
    Division of Biomedical Engineering,Faculty of Engineering,Hokkaido University.
  • Nishihira Morimasa
    Division of Biomedical Engineering,Faculty of Engineering,Hokkaido University.
  • Futamura Tomoaki
    Division Electric Information Engineering,School of Engineering, Hokkaido Tokai University.
  • Yamamoto Katsuyuki
    Division of Biomedical Engineering,Faculty of Engineering,Hokkaido University.

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  • 動脈壁の音速,音響インピーダンス,および反射率の計測

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In recent years,many studies on ultrasound measurement of the artery have been performed.However,acoustic properties of blood vessels,which are the bases of the ultrasound measurement,are little known.We measured the velocities of ultrasound,the acoustic impedance and the reflectivities of the aorta at 37 ℃ in rabbits u sing a new technique.The mean values of the velocity,the density and the impedance were 1601 ± 12 m, s,1.0719 ± 0.0004 g/cm[^3[^ a nd 1.716 g/cm[^2]/s,respectively.We measured also the reflectivities under the various hematocrit values of blood.The reflectivity decreased linearly with the hematocrit and showed the lowest value less than 1% around the normal hematocrit.

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