DocumentCode :
2478445
Title :
P3B-8 Signed Echo Imaging with High Axial Resolution
Author :
Umemura, Shin-ichiro ; Azuma, Takashi
Author_Institution :
Tohoku Univ., Sendai
fYear :
2007
fDate :
28-31 Oct. 2007
Firstpage :
1760
Lastpage :
1763
Abstract :
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)f0. 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.
Keywords :
acoustic impedance; biomedical ultrasonics; blood vessels; cardiovascular system; diseases; image resolution; medical image processing; acoustic impedance; arterial disease detection; conventional B-mode image; high axial resolution; human carotid arterial walls; phase-sensitive detection; signed echo imaging; ultrasonic signed echoes; Acoustic imaging; Acoustic signal detection; Arteries; High-resolution imaging; Humans; Image resolution; Impedance; Phase detection; Phase frequency detector; Ultrasonic imaging;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Ultrasonics Symposium, 2007. IEEE
Conference_Location :
New York, NY
ISSN :
1051-0117
Print_ISBN :
978-1-4244-1384-3
Electronic_ISBN :
1051-0117
Type :
conf
DOI :
10.1109/ULTSYM.2007.443
Filename :
4410016
Link To Document :
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