Time-frequency distribution applied to blood flow velocity profiles

被引：0

作者：

Rubio, E ^{[1
]}

Medina, L ^{[1
]}

Rodriguez, AO ^{[1
]}

机构：

[1] Univ Nacl Autonoma Mexico, IIMAS, DISCA, Mexico City 01000, DF, Mexico

来源：

PROCEEDINGS OF THE 25TH ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY, VOLS 1-4: A NEW BEGINNING FOR HUMAN HEALTH | 2003年 / 25卷

关键词：

time-frequency distribution; blood flow velocity profile; ultrasonic Doppler flow measurement;

D O I：

10.1109/IEMBS.2003.1279627

中图分类号：

R5 [内科学];

学科分类号：

1002 ; 100201 ;

摘要：

The Fourier analysis has become a standard tool to study blood flow in cardiovascular system. However it is not able to perform a time-frequency analysis of signals generated by the blood flow. Non-stationary signals, such as Doppler signals, require the notion of frequency analysis that is local in time. Time-frequency distributions can be applied to perform time-frequency analysis. The aim of this work is to reconstruct the blood flow profiles using Cohen's class time-frequency distribution by estimating the instantaneous frequency of a simulated pulsed Doppler signal. Velocity profiles were theoretically computed from Womersley's equation for a pulsatile stationary-state flow in a circular-cross section tube. Errors in the estimation of the pseudo-instantaneous mean frequency were computed for different sampling windows sizes. The blood flow velocity profiles of a carotid artery calculated with the Wigner-Ville time-frequency distribution show a good agreement with the velocity profiles given by the Womersley's model.

引用

页码：316 / 319

页数：4

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