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A Dynamic Spectral Difference Extraction Method with Equal Distance

A technology of dynamic spectrum and extraction method, which is applied in the direction of using spectrum diagnosis, medical science, diagnosis, etc., can solve the problems of reducing data reliability, reducing the accuracy of dynamic spectrum, fluctuations, etc., to avoid non-strict periodicity and reduce random noise Interference, the effect of ensuring credibility

Inactive Publication Date: 2021-06-29
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pulse wave of the human body is not a periodic signal in the strict sense, and the pulse wave in different cycles is not exactly the same, so the original difference extraction method uses the difference of the same sampling interval to extract the dynamic spectrum in each cycle, which will produce relatively A small difference reduces the reliability of the data, thereby reducing the accuracy of the dynamic spectrum; at the same time, the data transmission between the spectrometer and the PC takes time, affected by the performance of the PC, the transmission time is not strictly the same each time, resulting in the actual sampling There is a certain fluctuation between the time and the set ideal sampling time, which is also one of the reasons for affecting the accuracy of the dynamic spectrum
The existence of these factors makes the number of sampling points in each period of the final sampling and the time interval between adjacent sampling points not necessarily the same, and the single-edge extraction method in the time domain and the original difference extraction method do not consider the influence of these factors
Therefore, so far there is no convenient and effective method that can comprehensively consider various factors to extract high-quality dynamic spectra.

Method used

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  • A Dynamic Spectral Difference Extraction Method with Equal Distance
  • A Dynamic Spectral Difference Extraction Method with Equal Distance
  • A Dynamic Spectral Difference Extraction Method with Equal Distance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The embodiment of the present invention provides a method for extracting difference values ​​of dynamic spectra with equal intervals, see figure 1 , the difference extraction method includes:

[0043] 101: First divide the edge into upper and lower half edges with the same number of sampling points according to the value of each point on each edge of each cycle of the PPG template, such as figure 2 shown;

[0044] Wherein, the PPG template is obtained by superimposing and averaging the pulse wave signals at each wavelength. For the pulse wave cycle of each wavelength, the peak value is determined according to the PPG template, and the period between adjacent peak values ​​is determined as one cycle.

[0045] 102: Sliding the pulse wave signals at each wavelength on each half-edge of each cycle at intervals of half-wave peak heights to obtain a sub-dynamic spectrum;

[0046] Among them, the sliding motion difference at the interval of the half-wave peak height is spe...

Embodiment 2

[0051] Combine below Figure 3-Figure 6 The scheme in Example 1 is further introduced, see the following description for details:

[0052] The data used in the embodiment of the present invention were collected from 231 persons undergoing physical examination in the Physical Examination Center of Tianjin People's Hospital. collection devices such as image 3 As shown, the device is mainly composed of programmable regulated power supply, light source, optical fiber, spectrometer, USB interface and computer. The light source is a bromine tungsten lamp, which is powered by a programmable regulated power supply to make it work at the rated voltage. The effective wavelength range is 591nm -1044nm, the model of the spectrometer is AvaSpec-HS1024x58TEC, and the detection wavelength range is 200nm-1160nm.

[0053] Let the subject relax for a while before the test, and then let the front of the index finger completely cover the optical fiber entrance, keep the pressure constant durin...

Embodiment 3

[0075] Below in conjunction with concrete experimental data, the scheme in embodiment 1 and 2 is carried out feasibility verification, see the following description for details:

[0076] Using the single-edge extraction method, the original difference extraction method and this method to extract the dynamic spectrum of the data of 231 samples, the data extracted by the single-edge extraction method and the original difference extraction method are used as the control group. And the data extracted by this method are used as the experimental group.

[0077] Figure 7 Shown is a comparison chart of the dynamic spectrum extracted by three extraction methods of a certain sample. The comparison shows that the three waveforms are similar, but the amplitude of the dynamic spectrum extracted by this method is the largest, and compared with the control group, the experimental group The spurious peaks of , that is, the experimental group has a better denoising effect.

[0078] The dyna...

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Abstract

The invention discloses a difference value extraction method of dynamic spectrum with equal gap. The difference value extraction method includes: according to the numerical value of each point on each edge of each cycle of a PPG template, the edge is divided into equal number of sampling points. The upper and lower half-edges; the sub-dynamic spectrum is obtained by sliding the pulse wave signal under each wavelength on each half-edge of each cycle with the interval of half-wave peak height; Perform the superposition average to obtain the dynamic spectrum of equal distance difference. The invention improves the utilization rate and reliability of the data, reduces the non-strict periodicity of the human pulse wave, and the influence of inaccurate sampling caused by the transmission time between the spectrometer and the PC, and further improves the performance of the dynamic spectrum non-invasive blood component analysis. precision.

Description

technical field [0001] The invention relates to the field of dynamic spectrum extraction, in particular to an equal-distance dynamic spectrum difference extraction method. Background technique [0002] The dynamic spectrum theory proposed by Li Gang et al. [1] Dynamic Spectrum (DS) is constructed by extracting the difference of absorbance of pulse wave of each wavelength at different times, which avoids too many indirect measurements, and can eliminate the influence of individual differences and measurement environment, and provides a new method for improving the accuracy of non-invasive blood component analysis. Methods and Theory. Since the actual detected signal is a weak signal and is easily affected by other noises and interferences, the accuracy of dynamic spectral non-invasive blood component analysis is closely related to the control of the accuracy of various links such as collection, preprocessing, extraction, and modeling. Extracting high-quality dynamic spectra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/0295
CPCA61B5/0075A61B5/0295
Inventor 李刚王玉宇汤伟林凌
Owner TIANJIN UNIV