Automatic measurement of regional elasticity of carotid artery intima-media complex

Hideyuki Hasegawa, Hiroshi Kanai

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

1 Citation (Scopus)

Abstract

Artery wall elasticity and intima-media thickness (IMT) are useful markers for diagnosis of atherosclerosis. However, the regional elasticity of intima-media complex have never been measured. Therefore, we developed a method for imaging the regional elasticity by measuring changes in wall thickness due to heartbeat. In this method, multiple points are assigned in the wall along each ultrasonic beam with a pitch of the sampling interval of received echoes just before the ejection of the heart. Then, the displacement of each point is estimated, and the change in thickness between two points (=layer) is obtained from the difference between estimated displacements at these two points. The initial distance between these two points is determined in consideration of the duration of ultrasonic pulse. A spatial distribution of changes in thickness is obtained by shifting the combination of two points along each ultrasonic beam with a pitch of sampling interval of echo. Although, the original thickness of each layer is determined by the duration of the ultrasonic pulse, the estimated change in thickness should not be divided by the original thickness based on the pulse duration because only two dominant echoes from lumen-intima and media-adventitia boundaries contribute to displacement estimation in the case of a healthy subject. To obtain the actual strain, measured changes in thickness should be divided by the intima-media thickness. In this study, the intima-media elasticity is obtained from measured changes in thickness combined with the automatic detection of the intima-media thickness.

Original languageEnglish
Title of host publication2005 IEEE Ultrasonics Symposium
Pages1767-1770
Number of pages4
DOIs
Publication statusPublished - 2005 Dec 1
Event2005 IEEE Ultrasonics Symposium - Rotterdam, Netherlands
Duration: 2005 Sep 182005 Sep 21

Publication series

NameProceedings - IEEE Ultrasonics Symposium
Volume3
ISSN (Print)1051-0117

Other

Other2005 IEEE Ultrasonics Symposium
CountryNetherlands
CityRotterdam
Period05/9/1805/9/21

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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