Pulse wave velocity computation method based on wavelet transform

Abstract

When the heart beats, ventricular ejection is performed to genertate a pulse wave which is transmitted to the whole body at a certain velocity. The pulse wave velocity (PWV) refers to the velocity of the pulse wave which is transmitted from one position of an artery to another position of the artery. The parameter is always used in the diagnosis of vascular diseases and particularly used to judge the degree of vascular sclerosis. When the degree of vascular sclerosis increases, the arterial compliance is reduced and the PWV is increased. The current noninvasive measurement method of the PWV is to divide the length of a blood vessel by the conduction time of the pulse wave in the blood vessel, thus how to correctly identify the initial beating point becomes a main problem for calculating the PWV. The computation method of the invention utilizes wavelet transform to extract the initial beating point of the pulse wave. The method comprises the following steps: the multiresolution decomposition method is utilized to decompose the pulse wave, the a'trous algorithm is used to ensure that the decomposition result has the same length of the original signal and the detailed and general information of the pulse wave can be obtained; and the result of wavelet transform is compared with the pulse wave, and an obvious peak appears at the initial beating point of the pulse wave in the decomposition result of the pulse wave, thus the position of the initial beating point can be obtained through the comparison of the decomposition result and the pulse wave.

Description

1. Technical field [0001] The present invention relates to the calculation of pulse wave conduction velocity, in particular to the calculation method of pulse wave conduction time. 2. Background technology [0002] When the heart beats, the ejection of blood from the ventricles creates pulse waves that travel throughout the body at a certain rate. Pulse wave velocity PWV (Pulse Wave Velicity) refers to the rate at which the pulse wave travels from one point of the artery to another. This parameter is often used in the diagnosis of vascular diseases, especially for judging the degree of vascular sclerosis. When the degree of vascular sclerosis increases, the compliance of arteries decreases and the velocity of pulse wave conduction increases. The current non-invasive method of measuring pulse wave velocity is to divide the length of the blood vessel by the pulse wave transit time in this blood vessel. [0003] Its calculation formula is as follows: [0004] [0005] Am...

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Problems solved by technology

[0019] Aiming at the fact that the current method for extracting the pulse wave take-off point is unstable and susceptible to interference, the present invention proposes a new pulse wave take-off point extraction method, that is, the wavelet transform method is used to analyze the pulse wave and extract the pacing point of the pulse. point

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