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 |
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Conference Information |
Committee |
EA |
Conference Date |
2005-08-18 - 2005-08-19 |
Place (in Japanese) |
(See Japanese page) |
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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) |
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Keyword(1) |
ultrasound |
Keyword(2) |
center frequency |
Keyword(3) |
change in thickness of arterial wall |
Keyword(4) |
atherosclerosis |
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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.) |
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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 |
6 |
Date of Issue |
2005-08-11 (EA) |
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