An excitation current source for bioelectrical impedance imaging

A technology of excitation current source and bioelectrical impedance, which is applied in application, medical science, diagnosis, etc., can solve the problem of low output impedance, achieve the effect of improving output impedance, facilitating adjustment, and overcoming small output impedance

Active Publication Date: 2018-10-30
TIANJIN UNIV
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  • Abstract
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  • Application Information

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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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  • An excitation current source for bioelectrical impedance imaging
  • An excitation current source for bioelectrical impedance imaging
  • An excitation current source for bioelectrical impedance imaging

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Embodiment Construction

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

[0024] figure 1 It is a 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 amplifier module, a low-pass filter module, a voltage control current source module, and 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 output by the D / A conversion module. ...

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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 (EIT) is a new type of non-invasive imaging detection technology. This technology has the advantages of functional imaging, low cost, and harmless to the human body. Therefore, it has a wide range of application prospects in the medical and clinical 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 as to extract the electrical characteristics of tissues or organs related to human physiology and pathological conditions. [0003] In order to reduce the influence of the internal impedance change of the human body and the skin contact impedance on the excitation current source, it is required that the excitation current sourc...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H03M1/66A61B5/053
CPCA61B5/0536H03M1/66
Inventor许燕斌杨现仃董峰
OwnerTIANJIN UNIV