Method for identifying dicrotic notch point in arterial tension signal

A technology of dicrotic notch and identification method, which is applied in vascular assessment, cardiac catheterization, etc., and can solve problems such as low efficiency, heavy manual identification workload, and difficulty in ensuring accuracy.

Inactive Publication Date: 2012-02-01
CHONGQING UNIV
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Problems solved by technology

[0005] Aiming at the above-mentioned deficiencies in the prior art, the technical problem solved by the method of the present invention is to provide a computer-implemented method for identifying dicrotic notch points in arterial pressure signals to solve the problem of heavy workload, low efficiency, and accuracy of manual identification. Technical issues that are difficult to guarantee

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  • Method for identifying dicrotic notch point in arterial tension signal
  • Method for identifying dicrotic notch point in arterial tension signal
  • Method for identifying dicrotic notch point in arterial tension signal

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Embodiment

[0107] In this embodiment, arterial pressure signals are collected by an arterial pressure detector (VP-2000, Kelin Company, Japan), and these signals are input into a computer for low-pass filtering and sampling preprocessing. The filter adopts a second-order Butterworth low-pass filter, the cutoff frequency is 25Hz, and the sampling frequency is 250Hz, so as to obtain an arterial pressure signal to be measured, whose waveform is as follows figure 2 shown. Utilize the method of the present invention, adopt computer to carry out dicrotic notch point recognition to this arterial pressure signal to be measured, the dicrotic notch point recognition process is carried out according to the following steps:

[0108] A) build template database; This step specifically comprises:

[0109] a1) The arterial pressure detector collects multiple known arterial pressure signals (period, amplitude, location of dicrotic notch point and other parameters are known) with different period...

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Abstract

The invention provides a method for identifying a dicrotic notch point in an arterial tension signal, which is used for carrying out comprehensive analysis by combining with a waveform outline of the arterial tension signal, can overcome the influence of baseline drift of the arterial tension signal by using a differential vector between points as basic characteristics with translation and rotational invariance and adopting a log polar transformation distribution model, and is sensitive to adjacent waveform morphological characteristics, and can be used for capturing overall outline information of waveform, thus the antijamming capability of the identification of the dicrotic notch point is integrally improved; meanwhile, in an identifying process, the data calculated amount in the identifying process is greatly simplified through curvature differential identification, the integral robustness and the identification accuracy of the method provided by the invnetion are improved by adopting a chisquare statistic check as a matching means and the advantages of strong robustness and high accuracy of the chisquare statistic check. The method provided by the invention realizes that the dicrotic notch point in the arterial tension signal is identified by a computer, and has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of arterial pressure automatic detection and analysis, in particular to a method for identifying dicrotic notch points of arterial pressure signals based on waveform feature extraction and template matching. Background technique [0002] The arterial pressure signal carries important physiological and pathological information, such as the incidence and reflection of blood flow, cardiac stroke function, elasticity and stiffness of arterial wall, etc. The arterial pressure signal fluctuates with the beating of the heart. It is a quasi-periodic beat-by-beat signal that propagates in a continuous fluctuating manner. The starting point of each beat in the continuous beat-by-beat represents the arrival of a pulse wave. The interval is a complete beat signal, which provides important blood pressure information and heart beat information. The current blood pressure and heart parameters of the patient can be obtained...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/021
Inventor 赵明玺杨力彭承琳
Owner CHONGQING UNIV
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