Signed echo imaging of carotid arteries

Shinichiro Umemura, Takashi Azuma

Research output: Contribution to journalConference articlepeer-review


A new method is proposed to detect whether the sign of acoustic impedance change in space is positive or negative. Ultrasonic signed echoes were obtained by two times of transmission/reception at a center frequency ratio of N: N+1 (N: a natural number), calculating the (N+1)-th power of the received echo signal at a center frequency of Nf0, and the N-th power of the received echo signal at a center frequency of (N+1)f0, and then performing phase-sensitive detection betweenthe resulting two signals at N(N+1)f0. The signed echo images of human carotid arteries were taken at 6.2 and 9.3 MHz (2:3). The layer structure of the arterial wall was clearly observed with a healthy volunteer while the sign of its echo was significantly less uniform with a volunteer with presumable plaques.

Original languageEnglish
Article number4803644
Pages (from-to)17-20
Number of pages4
JournalProceedings - IEEE Ultrasonics Symposium
Publication statusPublished - 2008 Dec 1
Event2008 IEEE International Ultrasonics Symposium, IUS 2008 - Beijing, China
Duration: 2008 Nov 22008 Nov 5

ASJC Scopus subject areas

  • Acoustics and Ultrasonics


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