IEICE Technical Committee Submission System
Conference Paper's Information
Online Proceedings
[Sign in]
Tech. Rep. Archives
 Go Top Page Go Previous   [Japanese] / [English] 

Paper Abstract and Keywords
Presentation 2005-08-18 13:30
Accuracy Improvement in Estimation of Minute Change in Thickness of Arterial Wall by Determining Center Frequency of Ultrasonic Echo
Hideyuki Hasegawa, Hiroshi Kanai (Tohoku Univ.)
Abstract (in Japanese) (See Japanese page) 
(in English) Noninvasive measurement of mechanical properties, such as elasticity, of
the arterial wall is useful for diagnosis of atherosclerosis. The
elasticity of the arterial wall can be estimated by combining
measurement of displacement of the arterial wall with that of blood
pressure. In general, the displacement of the arterial wall is estimated
from the phase shift of RF echoes between two consecutive frames using a
correlation estimator with quadrature demodulated complex
signals. Recently, digitized data of broadband RF echoes are available
in modern diagnostic equipment. The Fourier transform can be employed to
estimate the phase of the RF echo at each frequency within the RF
frequency bandwidth. Therefore, the phase shifts between RF echoes of
two consecutive frames can be estimated at multiple frequencies. In this
estimation, due to object displacement, the RF echo is time-shifted in
comparison with that of the previous frame. However, the position of the
time window for the Fourier transform is not changed between two
consecutive frames. This change in relative position between the RF echo
and the time window has a strong influence on the estimation of the
artery-wall displacement, resulting in error. To suppress this error,
the phase shift should be estimated at the actual RF center
frequency. In this report, this error suppression was investigated
through simulation experiments and in vivo experiments on the
human carotid artery.
Keyword (in Japanese) (See Japanese page) 
(in English) ultrasound / center frequency / change in thickness of arterial wall / atherosclerosis / / / /  
Reference Info. IEICE Tech. Rep., vol. 105, no. 230, EA2005-34, pp. 1-6, Aug. 2005.
Paper # EA2005-34 
Date of Issue 2005-08-11 (EA) 
ISSN Print edition: ISSN 0913-5685
Download PDF

Conference Information
Committee EA  
Conference Date 2005-08-18 - 2005-08-19 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To EA 
Conference Code 2005-08-EA 
Language English (Japanese title is available) 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Accuracy Improvement in Estimation of Minute Change in Thickness of Arterial Wall by Determining Center Frequency of Ultrasonic Echo 
Sub Title (in English)  
Keyword(1) ultrasound  
Keyword(2) center frequency  
Keyword(3) change in thickness of arterial wall  
Keyword(4) atherosclerosis  
Keyword(5)  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Hideyuki Hasegawa  
1st Author's Affiliation Tohoku University (Tohoku Univ.)
2nd Author's Name Hiroshi Kanai  
2nd Author's Affiliation Tohoku University (Tohoku Univ.)
3rd Author's Name  
3rd Author's Affiliation ()
4th Author's Name  
4th Author's Affiliation ()
5th Author's Name  
5th Author's Affiliation ()
6th Author's Name  
6th Author's Affiliation ()
7th Author's Name  
7th Author's Affiliation ()
8th Author's Name  
8th Author's Affiliation ()
9th Author's Name  
9th Author's Affiliation ()
10th Author's Name  
10th Author's Affiliation ()
11th Author's Name  
11th Author's Affiliation ()
12th Author's Name  
12th Author's Affiliation ()
13th Author's Name  
13th Author's Affiliation ()
14th Author's Name  
14th Author's Affiliation ()
15th Author's Name  
15th Author's Affiliation ()
16th Author's Name  
16th Author's Affiliation ()
17th Author's Name  
17th Author's Affiliation ()
18th Author's Name  
18th Author's Affiliation ()
19th Author's Name  
19th Author's Affiliation ()
20th Author's Name  
20th Author's Affiliation ()
Speaker Author-1 
Date Time 2005-08-18 13:30:00 
Presentation Time 30 minutes 
Registration for EA 
Paper # EA2005-34 
Volume (vol) vol.105 
Number (no) no.230 
Page pp.1-6 
#Pages
Date of Issue 2005-08-11 (EA) 


[Return to Top Page]

[Return to IEICE Web Page]


The Institute of Electronics, Information and Communication Engineers (IEICE), Japan