Increment magnifying type signal measuring device using for impedance imaging

A technology of electrical impedance imaging and signal measurement, which is applied in diagnostic recording/measurement, application, medical science, etc., can solve problems such as uncontrollable attenuation, inability to guarantee excitation current injection, adverse effects of excitation current surface potential measurement, etc., to improve The effect of measurement accuracy

Inactive Publication Date: 2008-02-20
CHONGQING UNIV
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Problems solved by technology

[0004] In the existing electrical impedance imaging system, the electrodes are usually separated from the measurement circuit, and they are connected by a long cable. This method will have adverse effects on the injection of the excitation current and the measurement of the surface potential.
On the one hand, the distributed capacitance and dist

Method used

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  • Increment magnifying type signal measuring device using for impedance imaging
  • Increment magnifying type signal measuring device using for impedance imaging
  • Increment magnifying type signal measuring device using for impedance imaging

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Embodiment Construction

[0027] Referring to accompanying drawing 1, a kind of incrementally amplified signal measurement device for electrical impedance imaging in the figure, comprises housing, electrode array 1, switch array 2, signal generation circuit 3, analog-to-digital conversion circuit 4, voltage / current Transformation circuit 5, voltage amplitude adjustment circuit 6, voltage filter amplifier circuit 7, differential operation circuit 8 and central control processing circuit 9; it is characterized in that:

[0028] (a) A pair of current excitation electrodes connected with the excitation current output end of the voltage / current conversion circuit 5 in the electrode array 1, and a measurement electrode whose output end is connected with the voltage filter amplifier circuit 7; the switch is controlled by the central control processing circuit 9 Array 2 switches electrodes in electrode array 1 to connect to the excitation current output terminal of voltage / current conversion circuit 5 or to vol...

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Abstract

The present invention relates to an increment amplifying type signal detecting device used in resistance imaging. The invention comprises an electrode array (1), a switch array (2), a signal generating circuit (3), an analog and digital transferring circuit (4), a voltage and current converting circuit (5), a voltage scale adjusting circuit (6), a voltage filtering and amplifying circuit (7), a difference computing circuit (8) and a central control processing circuit(9). Additionally, the invention has a probe case containing combined electrode and detecting circuit, which greatly shortens distance between the detecting circuit and the electrode, reduces unfavorable effects to signal detecting caused by capacitance on lead, distributed inductance and various electromagnetic interference. By amplifying increment during measurement, one can acquire high measuring accuracy with analog and digital converter of lower resolution.

Description

Technical field: [0001] The invention relates to a signal measuring device, in particular to an incremental amplification signal measuring device for electrical impedance imaging. Background technique: [0002] In the electrical impedance imaging technology, the method of applying excitation current to the measured object and detecting its surface potential is generally adopted. The injection of the excitation current and the pickup of the surface potential are realized through a set of electrodes that are in direct contact with the measured object. In a specific current excitation mode, the potential distribution on the surface of the measured object depends on the internal conductivity distribution of the measured object, that is to say, the surface potential of the measured object contains the information of its internal conductivity, thus through a specific algorithm The conductivity distribution inside the measured object can be inversely deduced to realize electrical ...

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Application Information

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IPC IPC(8): A61B5/053
Inventor 何为何传红张占龙罗辞勇毛玉星熊兰徐征
Owner CHONGQING UNIV
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