Measurements of regional propagation velocities of forward and reflected pulse waves by high frame rate ultrasonic imaging

Hideyuki Hasegawa, Kazue Hongo, Hiroshi Kanai

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Pulse wave velocity (PWV) is widely used to evaluate artery-wall elasticity. In the traditional PWV method, the average PWV is calculated between 2 points, the carotid and femoral arteries, at an interval of several tens of centimeters. However, it is preferable to measure PWV in a more local region because PWVs of carotid and femoral arteries are different and atherosclerosis often forms regional lesions. To estimate regional PWV, in the present study, minute vibration velocities of the carotid arterial wall were measured at intervals of 0.2 mm at M = 72 points assigned along the arterial longitudinal direction using the phased-tracking method at a high temporal resolution of 3472 Hz. In the estimation of PWV, acceleration waveforms were obtained by applying time differentiation to measured velocities to enhance high frequency components because the use of high frequency components will improve the temporal resolution in estimation of time delays among the vibration waveforms occurred by pulse wave propagation. Time delays were estimated using analytic signals of acceleration waveforms obtained by Hilbert transform. PWV was estimated from the slope and intercept of the relationship between the phase angle of the complex correlation function of analytic signals and lag. Carotid arteries of three healthy subjects were measured in vivo. PWVs in short longitudinal segments of 14.4 mm were estimated to be 5.6, 6.4, and 6.7 m/s for the pulse wave component propagating from the heart to the periphery. Estimated PVWs were in good agreement with those reported in literature. Furthermore, in one of the subjects, there was a component reflected by the peripheral arteries. Propagation speed of the reflection component could be also separately estimated to be-8.4 m/s. The higher PWV of the reflection component was considered to be the difference in blood pressure at the arrival times of the forward and reflection components. The proposed method for measurement of regional PWV would be useful for more sensitive evaluation of the change in elasticity due to progress of atherosclerosis.

Original languageEnglish
Title of host publication2012 IEEE International Ultrasonics Symposium, IUS 2012
Pages2544-2547
Number of pages4
DOIs
Publication statusPublished - 2012 Dec 1
Event2012 IEEE International Ultrasonics Symposium, IUS 2012 - Dresden, Germany
Duration: 2012 Oct 72012 Oct 10

Publication series

NameIEEE International Ultrasonics Symposium, IUS
ISSN (Print)1948-5719
ISSN (Electronic)1948-5727

Other

Other2012 IEEE International Ultrasonics Symposium, IUS 2012
CountryGermany
CityDresden
Period12/10/712/10/10

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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