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Mixing bio-impedance measurement method based on Fourier conversion

A technology of Fourier transform and bio-impedance, applied in diagnostic recording/measurement, medical science, special data processing applications, etc., can solve problems such as increasing difficulty

Inactive Publication Date: 2006-12-13
TIANJIN UNIV
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Problems solved by technology

For different frequencies, the software generates a series of in-phase and quadrature reference sequences corresponding to the frequency components of the measured signal, and then multiplies and accumulates with the measured signal to obtain the modulus and phase angle of the biological impedance at this frequency, while The disadvantage of this method is that the corresponding reference sequence needs to be increased or decreased according to the number of frequency components of the measured signal, which increases the difficulty of program implementation

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  • Mixing bio-impedance measurement method based on Fourier conversion
  • Mixing bio-impedance measurement method based on Fourier conversion
  • Mixing bio-impedance measurement method based on Fourier conversion

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Embodiment Construction

[0048] The present invention will be further described below in conjunction with the accompanying drawings and through specific embodiments.

[0049] The mixed-frequency bio-impedance measurement method based on Fourier transform proposed by the present invention can be realized by using various hardware solutions. The measurement system of this embodiment is based on direct digital synthesis chip (DDS), voltage-controlled current source (VCCS) and virtual instrument (LabVIEW ) bioimpedance measurement system.

[0050] The hardware configuration of the measurement system is as follows: figure 1 As shown, it mainly includes a signal generation circuit for generating excitation sine signals, a signal conditioning circuit for amplifying and filtering functions, an AD acquisition card and a PC for performing AD conversion on the measured path and the reference path.

[0051] The signal generation circuit generates the frequency mixing excitation current signal. In the system, two...

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Abstract

The invention provides the frequency mixing biology impedance measurement method based on method of Fourier transformation, comprising the following steps: 1 defining parameters, getting checking path and reference path voltage signal sequence; 2 calculating with Fourier transformation; 3 reverting to path compensating calculation. The invention uses the method to get casting and phase angle of biology impedance information. The method uses computer to calculate, simplifying the hardware circuit, removing noise interference and improving the measurement accuracy. The method is based on the Fourier transformation demodulation calculation, directly carries out dispersion Fourier transformation for measured signal, and gets the biology impedance information. At the course of measuring, the method only adjusts sampling frequency, signal frequency and sampling points to directly measure, improving the measurement accuracy.

Description

technical field [0001] The invention belongs to the field of biological information detection, and in particular relates to a Fourier transform-based mixing biological impedance measurement method adopted in a mixing excitation mode. Background technique [0002] Bioimpedance measurement technology is a non-destructive detection technology that uses the electrical properties (impedance, admittance, dielectric constant) and changes of biological tissues and organs to extract biomedical information related to human physiology and pathology. It usually applies a small alternating current (or voltage) signal to the measured object by means of the excitation electrode placed on the body surface, and at the same time detects the voltage (or current) signal on the tissue surface through the measuring electrode, and calculates the corresponding signal from the measured signal. Impedance and its changes, to obtain relevant physiological and pathological information. [0003] Because...

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Application Information

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IPC IPC(8): A61B5/053G06F19/00
Inventor 王超章晓丽
Owner TIANJIN UNIV
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