Data acquiring device for bioelectrical impedance imaging

Abstract

The invention relates to a data acquiring device for bioelectrical impedance imaging. The data acquiring device comprises a control unit, wherein the control unit is in parallel connection with a signal generator; the signal generator is connected with a voltage-controlled current source circuit; the voltage-controlled current source circuit is connected with a multi-way switch; the multi-way switch is connected with an electrode array and a signal conditioning module; voltage is transmitted into a DSP module through the signal conditioning module; the DSP module comprises an analog to digital converter and a digital demodulator; the DSP module is connected with a host computer; the control unit is used for transmitting data to the DSP module; an excitation current is injected to the electrode array by the voltage-controlled current source through the multi-way switch; the multi-way switch is used for acquiring the voltage on the electrode array; the voltage is transmitted to the DSP module through the signal conditioning module; the DSP module is used for performing modulus transformation on a voltage signal and then performing digital demodulation; and the data is transmitted to the host machine for image reconstruction. According to the data acquiring device disclosed by the invention, the data processing speed is accelerated, the speed and the precision of bioelectrical impedance data acquisition can be effectively increased, and the image reconstruction quality is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of biomedical electrical impedance imaging, and in particular relates to a data acquisition device for bioelectrical impedance imaging. Background technique [0002] Electrical Impedance Tomography (EIT) is a new direction of medical imaging (Medical Imaging) technology. EIT uses the impedance distribution of biological tissues or organs as the imaging target to extract biomedical information related to physiology and pathology. Non-invasive, non-invasive, non-radiation, low cost and other advantages. At the same time, the biggest advantage of EIT technology lies in functional imaging, which can monitor and examine the disease in the early stage or before the lesion. Because of this, since the advent of EIT technology, it has aroused great interest and extensive attention of researchers at home and abroad. At present, China is still in the stage of laboratory research in the field of EIT technology, and th...

AI Technical Summary

Problems solved by technology

[0004] In the EIT system, the voltage-controlled current source (VCCS) generally uses the Howland current source circuit. Due to the presence of positive and negative feedback in the circuit at the same time, when the current source is multi-frequency, the circuit will be unstable, and with the frequency of the signal source increase, the circuit will be affected by the limitations of the integrated device itself and the stray capacitance

The method often used for signal demodulation is analog demodulation. On the one hand, it is difficult to debug analog circuits and the circuit will become complicated; on the other hand, analog demodulation will be limited by the frequency of the signal source, which will affect the speed and accuracy of data processing.

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