Real-time heart beat interval measuring and calculating method for ballistocardiogram

Abstract

The invention provides a real-time heart beat interval measuring and calculating method for a ballistocardiogram. The real-time heart beat interval measuring and calculating method comprises the following steps of S1, collecting BCG signals; s2, preprocessing the collected BCG signals, wherein the preprocessing comprises filtering thermal noise removal and baseline processing and morphological filtering breathing interference removal processing; s3, positioning a J peak of each BCG signal in real time, and measuring a real-time JJ interval; s4, calculating an instantaneous heart rate and a multi-time scale average heart rate; s5, displaying the BCG waveform, the instantaneous heart rate and the multi-time scale average heart rate; the problems that the traditional BCG real-time heart beat detection upper limit range is too low (lower than 120 times / min), and the detection error of the continuous heart beat interval is too large during the short-time body movement interference (smaller than 4s) are also solved.

Description

technical field [0001] The invention relates to the technical field of medical measurement and calculation, in particular to a real-time measurement and calculation method of heartbeat interval by ballistocardiogram. Background technique [0002] A ballistocardiogram depicts the faint movements of the body caused by the shock and rebound of the heart and great blood vessels as the heart works and blood circulates. The shape of the ballistocardiogram curve is rich, including 5 bands of H, I, J, K, and L. Thanks to the rapid development of sensor technology, the acquisition of the ballistocardiogram can be relatively accurately acquired when the user is at rest. Since the ballistocardiogram is related to cardiac contractility, cardiac output, blood flow velocity, and great vessel elasticity, the collection and positioning of the ballistocardiogram signal is of certain significance for further analysis of heart rate variability and cardiac function tests. [0003] See attache...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, there are two problems. Problem 1: The basis of traditional instantaneous heart rate calculation is to identify the J peak of each BCG signal, and calculate the instantaneous heart rate of the current heartbeat with the help of the J-J interval of the adjacent BCG signal

Question 2: The general idea of ​​the traditional BCG signal positioning technology solution is: take the current BCG signal (i-th) J-peak time as the reference, traverse forward with a fixed time scale, and search for the next BCG signal (i+1) J-peak

Taking the commonly used search time scale of 0.5s-1.5s in the literature as an example, it is most suitable for scenarios with a heart rate of 120 beats / min. When the heart rate is higher than 120 beats / min, the above forward traversal interval not only ignores the A BCG signal (i+1th) J peak, but at the same time covers up to 3 non-adjacent BCG-J peaks (i+2, i+3 or even i+4th BCG signal), resulting in the inability to accurately measure heart rate Adjacent J-J intervals >120 beats / min

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