Reduction of influence of decrease in SNR of ultrasonic pulse during cardiac cycle in measurement of small change in thickness of arterial wall

Hideyuki Hasegawa, Hiroshi Kanai, Nozomu Hoshimiya, Yoshiro Koiwa

Research output: Contribution to journalConference articlepeer-review

Abstract

We have previously proposed a method for measuring the small change in thickness of the arterial wall during the cardiac cycle [1][2], which cannot be measured from conventional B-mode or M-mode images because of its small amplitude of less than 100 micrometer. However, in spite of its great usefulness for in vivo assessment of the local elasticity of the arterial wall, there are cases where successful measurements based on only two consecutive echo signals fail because of low signal-to-noise ratio (SNR) during the cardiac cycle. To realize the proposed method in practical use, this problem must be overcome. In this paper, we propose a method that is more robust in the presence of noise. In this method, more than two echo signals are employed in estimation of their phase shift for reducing the influence of low SNR. Simulation experiments provide the optimal value of the estimation period (the number of echo signals) for each SNR. By evaluating the SNR of in vivo experimental data, the optimal estimation period is determined. In in vivo experiment, by using the optimal estimation period of 20 ms, the change in thickness can be measured with good reproducibility even in the case of low SNR of 28 dB.

Original languageEnglish
Pages (from-to)1337-1340
Number of pages4
JournalProceedings of the IEEE Ultrasonics Symposium
Volume2
Publication statusPublished - 1999 Dec 1
Event1999 IEEE Ultrasonics Symposium - Caesars Tahoe, NV, USA
Duration: 1999 Oct 171999 Oct 20

ASJC Scopus subject areas

  • Engineering(all)

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