片倉 景義¹, 千田 彰一², 西谷 智彦², 弓場 雅夫², 松尾 裕英²

Kageyoshi KATAKURA¹, Shouichi SENDA², Tomohiko NlSHIYA², Masao YUBA², Hirohide MATSUO²

¹日立製作所中央研究所, ²香川医科大学第2内科

¹Central Research Laboratory Hitachi Ltd. , ²Department of Internal Medicine Kagawa Medical School

キーワード : Coherency, Correlation, Doppler, Pressure-wave velocity

Doppler signals generated by liquid flow were measured at two closely spaced locations along a vessel. The proposed method for measuring local blood pressure pulse-wave propagation speed employs one processing procedure to increase coherency between the two Doppler signals and performs the complex crosscorrelational analysis on the processed signals. This method uses 2-MHz Doppler signals taken simultaneously from a model circulation pulse flow to produce a sharp correlation peak with a precision of 1-ms delay-time.