Transcutaneous measurement and spectrum analysis of heart wall vibrations

Hiroshi Kanai, Michie Sato, Yoshiro Koiwa, Noriyoshi Chubachi

研究成果: Article査読

240 被引用数 (Scopus)


For the nnninvasive diagnosis of heart disease based on the acoustic and elastic characteristics of the heart muscle, it is necessary to transcutaneously measure small vibration signals, including components with an amplitude of less than 100 /mi, from various parts of the heart wall continuously for periods of more than several heartbeats in a wide frequency range up to 1 kHz. Such measurement, however, has not been realized by any ultrasonic diagnostic methods or systems to date. By introducing the constraint least-square approach, this paper proposes a new method for accurately tracking the movement of the heart wall based on both the phase and magnitude of the demodulated signal to determine the instantaneous position of the object so that the vibration velocity of the moving object can be accurately estimated. By this method, small vibrations of the heart wall with small amplitudes less than 100 /nil on the motion resulting from a heartbeat with large amplitude of 10 mm can be successfully detected with sufficient reprodueibility in the frequency range up to several hundred Hertz continuously for periods of about 10 heartbeats. The resultant small vibration is analyzed not only in the time domain, but also in the frequency domain. As confirmed by the preliminary experiments herein reported, the new method offers potential for research in acoustical diagnosis of heart disease.

ジャーナルIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
出版ステータスPublished - 1996

ASJC Scopus subject areas

  • 器械工学
  • 音響学および超音波学
  • 電子工学および電気工学


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