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Exciting current source for bioelectrical impedance imaging

A technology of excitation current source and bioelectrical impedance, which is applied in application, medical science, digital-to-analog converter, etc., can solve the problem of low output impedance, achieve the effect of improving output impedance, overcoming small output impedance, and convenient adjustment

Active Publication Date: 2016-06-08
TIANJIN UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to provide an excitation current source for bioelectrical impedance imaging, which overcomes the problem of low output impedance of the previous excitation current source, thereby improving the imaging accuracy of the electrical impedance imaging system

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  • Exciting current source for bioelectrical impedance imaging
  • Exciting current source for bioelectrical impedance imaging
  • Exciting current source for bioelectrical impedance imaging

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Embodiment Construction

[0023] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] figure 1 It is a structural block diagram of the present invention. As shown in the figure, an excitation current source for bioelectrical impedance imaging includes a DDS module, an amplitude control module, a D / A conversion module, a differential amplification module, a low-pass filter module, a voltage control current source module, and a general impedance Conversion module. The DDS module is constructed inside the FPGA and implemented through hardware language programming. By setting the internal parameters of the DDSIP core, the number of DDS output bits can be changed, and single-frequency and multi-frequency excitation can be realized. The 14-bit sinusoidal digital signal generated by the DDS module is input to the 14-bit data input terminal of the D / A conversion module, and then converted into an analog differential current o...

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Abstract

The invention provides an exciting current source for bioelectrical impedance imaging. The exciting current source for bioelectrical impedance imaging comprises a DDS module, an amplitude control module, a D / A conversion module, a differential amplification module, a lowpass filtering module, a voltage control current source module and a universal impedance conversion module, wherein the universal impedance conversion module comprises an analog multiplexer (16) and multi-channel universal impedance converters, the on-off state is controlled through an FPGA, and gating is performed on the universal impedance converter matched with exciting frequency; the multi-channel universal impedance converters can be applicable to four frequency ranges of 0-100k Hz, 100-500k Hz, 500-800k Hz and 800k Hz-1M Hz, and there are different equivalent inductance values in each frequency range. By means of the exciting current source for bioelectrical impedance imaging, imaging precision of an electrical impedance imaging system can be improved.

Description

technical field [0001] The invention belongs to the technical field of electrical impedance imaging, and relates to an excitation current source for bioelectrical impedance imaging. Background technique [0002] Electrical Impedance Tomography (Electrical Impedance Tomography, EIT) is a new type of non-destructive imaging detection technology. This technology has the advantages of functional imaging, low cost, and harmless to the human body. Therefore, it has broad application prospects in the clinical medical field. Electrical impedance imaging technology is to place array electrodes on the surface of the human body, apply current excitation signals, and test voltage signals, so that the electrical characteristics of tissues or organs related to human physiological and pathological states can be extracted. [0003] In order to reduce the impact of changes in the internal impedance of the human body and skin contact impedance on the excitation current source, it is required ...

Claims

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Application Information

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IPC IPC(8): H03M1/66A61B5/053
CPCA61B5/0536H03M1/66
Inventor 许燕斌杨现仃董峰
Owner TIANJIN UNIV
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