Methods for calculating non-baseline part and baseline of fetal heart rate curve

A calculation method and technology for fetal heart rate, which are applied in the fields of biomedical signal processing and electronic fetal monitoring, can solve the problems of low calculation efficiency, unclear distinction between non-baseline parts of fetal heart rate curve, and baseline influence, and achieve high calculation efficiency, Solve the inefficiency of the algorithm and the effect of inaccurate estimation

Active Publication Date: 2015-01-21
GUANGZHOU SUNRAY MEDICAL APP
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AI Technical Summary

Problems solved by technology

Each method has its own advantages and disadvantages: 1. The first method has high calculation efficiency, but sometimes there will be large errors in the baseline obtained, such as for the fetal heart rate curve with continuous acceleration or deceleration, the obtained The baseline tends to increase or decrease; 2. The second method can effectively improve the shortcom

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  • Methods for calculating non-baseline part and baseline of fetal heart rate curve
  • Methods for calculating non-baseline part and baseline of fetal heart rate curve
  • Methods for calculating non-baseline part and baseline of fetal heart rate curve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The calculation method of the non-baseline portion of the fetal heart rate curve mainly includes the following steps:

[0054]Step A1, select several non-overlapping intervals from the fetal heart rate curve, the fetal heart rate value at the endpoint of each interval is equal to the reference value of the fetal heart rate curve, and the reference value of the interval is equal to the Endpoint fetal heart rate values, the fetal heart rate values ​​in each of the intervals are greater than or less than the reference value of the interval;

[0055] It should be pointed out that, in this embodiment, the reference value of the fetal heart rate curve can be obtained by using the existing technology: find the stable part in the fetal heart rate curve, and the fetal heart rate curve with the largest number in the stable part The heart rate value is the reference value of the fetal heart rate curve, and the specific method can be found in: S.Andersson.Acceleration and decelerat...

Embodiment 2

[0088] This embodiment is basically the same as Embodiment 1, except that the characteristics of the non-baseline interval also include:

[0089] greater than [H in the non-baseline interval 0 +k*(FHR max -H 0 )] The proportion of the duration of the fetal heart rate value to the duration of the non-baseline interval is not less than R; the H 0 is the reference value of the non-baseline interval, the FHR max is the maximum fetal heart rate value in the non-baseline interval, k is a preset coefficient, and R is a preset threshold;

[0090] The suspected non-baseline interval features also include:

[0091] The suspected non-baseline interval is greater than [H 0 +k*(FHR max -H 0 )] The proportion of the duration of the fetal heart rate value to the duration of the suspected non-baseline interval is less than R.

[0092] like image 3 As shown, for each said non-baseline interval or suspected non-baseline interval, calculate the duration of the interval t total and withi...

Embodiment 3

[0100] On the basis of Embodiment 1 or 2, the present invention also provides an embodiment of a fetal heart rate baseline calculation method, which includes the following steps:

[0101] S1. Calculate the non-baseline portion of the fetal heart rate curve based on the method for calculating the non-baseline portion of the fetal heart rate;

[0102] like Figure 4 As shown, in this embodiment, the non-baseline portion of the fetal heart rate curve includes I 1 , I 2 , I 3 , I 411 , I 412 , I 42 .

[0103] S2. Perform interpolation and smoothing after clearing the non-baseline portion of the fetal heart rate curve;

[0104] S3. In the interpolated and smoothed fetal heart rate curve, calculate several fetal heart rate points in the fetal heart rate baseline; perform interpolation on several fetal heart rate points in the fetal heart rate baseline , smoothing and filtering to obtain the fetal heart rate baseline.

[0105] In this embodiment, the specific implementation ...

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Abstract

The invention discloses a method for calculating a non-baseline part of a fetal heart rate curve. The method is characterized in that a non-baseline section is characterized in that the maximum offset between the fetal heart rate value and a base value of the non-baseline section is not less than Dmin, and the duration time is not shorter than Tmin and not longer than Tmax; a suspected non-baseline section is characterized in that the maximum offset between the fetal heart rate value and a base value of the suspected non-baseline section is not less than Dmin, and the duration time is longer than Tmax; for the suspected non-baseline section, the base value bmp of the suspected non-baseline section is adjusted each time, so that the duration time of the suspected non-baseline section is shortened, and then whether the suspected non-baseline section meets the characteristics of the non-baseline section is judged again. According to the methods for calculating the non-baseline part and a baseline of the fetal heart rate curve, the fetal heart rate curve baseline can be accurately recognized especially for the fetal heart rate curve in which acceleration and deceleration frequently occur, and the problem that the baseline can not be accurately estimated through an algorithm based on a numerical treatment method is solved. Meanwhile, the method is high in calculation efficiency, and solves the problem that an algorithm based on an artificial intelligence method is low in efficiency.

Description

technical field [0001] The invention relates to the fields of biomedical signal processing and electronic fetal monitoring, in particular to a calculation method for a non-baseline portion of a fetal heart rate curve and a baseline. Background technique [0002] Fetal electronic monitoring is mainly through continuous observation and recording of changes in fetal heart rate to determine the safety of the fetus in utero. Changes in fetal heart rate are the result of fetal central nervous system regulation. The fetal heart rate curve is a record of fetal heart rate changes over a period of time, and it mainly includes four important parameters: baseline, variation, acceleration and deceleration. By reading and identifying these parameters, obstetric medical staff can timely grasp the status of fetal development in utero and make clinical decisions. Among these parameters, the fetal heart rate baseline is the most critical parameter, and the rest of the parameters need to be ...

Claims

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Application Information

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IPC IPC(8): A61B5/024
CPCA61B5/02411
Inventor 李晓东秦如意
Owner GUANGZHOU SUNRAY MEDICAL APP
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