Signed echo imaging with high axial resolution

Shin Ichiro Umemura, Takashi Azuma

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

1 Citation (Scopus)


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 between the resulting two signals at N(N+1)f 0. An ultrasonic signed echo image of human carotid arterial walls was taken at 5 and 10 MHz with a healthy volunteer. The high axial resolution of the echo image was maintained so that the layer structure of the arterial walls can be observed in the signed echo image as well as in the corresponding conventional B-mode image.

Original languageEnglish
Title of host publication2007 IEEE Ultrasonics Symposium Proceedings, IUS
Number of pages4
Publication statusPublished - 2007 Dec 1
Event2007 IEEE Ultrasonics Symposium, IUS - New York, NY, United States
Duration: 2007 Oct 282007 Oct 31

Publication series

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


Other2007 IEEE Ultrasonics Symposium, IUS
Country/TerritoryUnited States
CityNew York, NY

ASJC Scopus subject areas

  • Acoustics and Ultrasonics


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