CN102274025A - Multi-electrode electrical impedance tomography data acquisition system - Google Patents
Multi-electrode electrical impedance tomography data acquisition system Download PDFInfo
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- CN102274025A CN102274025A CN 201110142394 CN201110142394A CN102274025A CN 102274025 A CN102274025 A CN 102274025A CN 201110142394 CN201110142394 CN 201110142394 CN 201110142394 A CN201110142394 A CN 201110142394A CN 102274025 A CN102274025 A CN 102274025A
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Abstract
The invention discloses a multi-electrode electrical impedance tomography data acquisition system which comprises a driving signal source, an analog switch unit, a cylindrical electrode model, a current sampling module, a voltage sampling module, a program-controlled amplification module, a true RMS (Root Mean Square) conversion module, an A/D (Analog to Digital) conversion module, a programmable gate array chip, a FLASH memory and a synchronous dynamic memory. The invention aims to experimentally analyze the boundary conditions of a research object, the distribution of electric fields in the research object and the relationship between a preset path for imaging and an actual path on the theoretical basis, thereby providing a methodological basis for further improving the electrical impedance tomography resolution. The substantial characteristic and significant progress of the invention mainly lie in the uniform space distribution of the electrodes, and the electric fields formed in different rotation directions have high consistency; the data acquisition capacity is large, and after each electrical rotation cycle, 32768 pieces of data can be acquired under the drive of a single-frequency signal; and by using the invention, multiple methods can be conveniently used for the research of electrical impedance tomography.
Description
Technical field
The present invention relates to biomedical imaging, detect research field, especially relate to multi-electrode electrical impedance tomography data collecting system.
Background technology
Electrical impedance tomography (EIT-electrical impedance tomography) is an important directions of medical imaging research field, is with the anti-technology that is distributed as a kind of biomedical detection with the imaging of imageable target of organism internal resistance.This technology is that non-intrusion type detects, and has the characteristics of functional imaging, therefore, and the extremely concern of researcher.
At present, the type of drive of electrical impedance tomography is mainly current drives and field drives mode, and metering system mainly contains voltage measurement, current measurement, magnetic-field measurement mode.For obtaining enough imaging datas, current multi-electrode (16 electrodes, 32 electrodes, 64 electrodes, 128 electrodes etc.) and the multifrequency modes of adopting more.But the data that border electrode obtained can not exact expression and the distribution relation of internal electric field (or magnetic field), adds the influence of system accuracy, makes imaging resolution can not satisfy the needs of clinical diagnosis.
Summary of the invention
The object of the invention is to provide the simultaneously-measured multi-electrode electrical impedance tomography of a kind of multi-electrode, multi-angle, current potential and electric current data collecting system.
For achieving the above object, the present invention can take following technical proposals:
Multi-electrode electrical impedance tomography data collecting system of the present invention, comprise source driving signal, analog switch unit, drum electrode model, the current sample module, the voltage sample module, program control amplification module, real effective modular converter, the A/D modular converter, the programmable gate array chip, FLASH memorizer, synchronous dynamic random access memory; At least eight layers of electrode unit that described drum electrode model is horizontally set on the described staving insulation inwall by staving, from top to bottom constitute; Every layer of electrode unit all has 128 electrode gap to arrange setting; Each electrode in described every layer of electrode unit is electrically connected with described source driving signal by the analog switch in the described analog switch unit respectively; Described current sample module, voltage sample module are made of the sampling resistor on each electrode that is connected electrically in every layer of electrode unit, and the other end of described each sampling resistor is electrically connected with analog switch in the analog switch unit respectively; The sampled signal of current sample module, voltage sample module respectively behind described program control amplification module, real effective modular converter and A/D modular converter by described programmable gate array chip-stored in the FLASH memorizer; The control signal output ends of programmable gate array chip is electrically connected with the control signal input of the control signal input of analog switch unit, program control amplification module respectively.
Described staving is made of the folded from top to bottom system of nine pcb boards, and wherein the middle part of Shang Mian eight pcb boards offers circular hole respectively; Isolate with the annular silica gel sealing pad that is arranged on the upper and lower anchor ring of annular insulating cell by annular insulating cell respectively between nine pcb boards around described circular hole; The circular hole that centers on the pcb board of top layer is stacked with Gask-O-Seal and annular lucite insulating cell; Nine pcb boards connect as one by the bolt that runs through its plate face; The diameter of described annular insulating cell, annular silica gel sealing pad, sealing gasket and annular lucite insulating cell is greater than the diameter of described circular hole; Circular hole side face at every pcb board evenly is arranged at intervals with 128 electrodes to constitute described electrode unit.
Each electrode on the described every pcb board all has and is fixed on this pcb board circular hole and constitutes along the Copper Foil of the corresponding position of upper and lower plate face, and upper and lower Copper Foil is electrically connected by via hole; Be electrically connected by female realization of pricking with needle row disposed thereon between the upper and lower pcb board.
The present invention is intended on the theoretical basis with the method for testing, the analyze and research boundary condition of object and internal electric field distributes and the preset path of imaging and the relation between the Actual path, for the resolution that further improves electrical impedance tomography provides foundation on the method.Substantive distinguishing features that it possessed and obvious improvement be mainly reflected in following some:
1, the number of electrodes that adopts the PCB processing technology to form is many, and electrode space is evenly distributed, and forms the high conformity of electric field on the different rotary direction;
2, same electrode, upper and lower correspondence are distributed in top, the two sides, the end on pcb board circular hole edge, reduce the analysis difficulty of electrode direction of an electric field that pole-face the brings change that is parallel to pcb board of PCB processing technology formation to greatest extent;
3, electrode, electronic devices and components connect on same PCB, between the upper and lower pcb board with pricking with needle, the female physics that carries out of row, be electrically connected the drum electrode model that is constituted, compact conformation, do not have soft lead-in wire, reduced the influence of lead-in wire distribution capacity, electromagnetic interference to greatest extent measuring-signal;
4, the image data amount is big, and under single frequency signal drove, electric rotating a circle can be obtained 32768 data;
5, applying on the electrode that drives signal, taking to measure the data of intermediate current, current potential, can reduce because the restriction of processing technique applies the analysis difficulty of the complicated Electric Field Distribution at driving signal electrode edge to the influence of border condition responsive;
6, by different programs, change different driving, metering system, can be easily with the research of several different methods to electrical impedance tomography.
Description of drawings
Fig. 1 is a schematic block circuit diagram of the present invention.
Fig. 2 is the structural representation of drum electrode model of the present invention.
Fig. 3 is the I portion enlarged diagram of Fig. 2.
Fig. 4 is the plan structure sketch map of drum electrode model of the present invention.
Fig. 5 is the J portion enlarged diagram of Fig. 4.
Fig. 6 is electric current, the voltage sample state Electric Field Distribution sketch map in the drum electrode model bucket of the present invention.
The specific embodiment
As Fig. 1, shown in Figure 6, multi-electrode electrical impedance tomography data collecting system of the present invention comprises source driving signal, analog switch unit, the drum electrode model, current sample module, voltage sample module, program control amplification module, the real effective modular converter, A/D modular converter, programmable gate array chip, the FLASH memorizer, synchronous dynamic random access memory; Eight layers of electrode unit that described drum electrode model is horizontally set on the described staving insulation inwall by staving, from top to bottom constitute; Every layer of electrode unit all has 128 electrodes 1 to be spaced setting; Each electrode 1 in described every layer of electrode unit is electrically connected with described source driving signal by the analog switch in the described analog switch unit respectively; Described current sample module, voltage sample module are made of the sampling resistor on each electrode that is connected electrically in every layer of electrode unit, and the other end of described each sampling resistor is electrically connected with analog switch in the analog switch unit respectively; The sampled signal of current sample module, voltage sample module respectively behind described program control amplification module, real effective modular converter and A/D modular converter by described programmable gate array chip-stored in the FLASH memorizer; The control signal output ends of programmable gate array chip is electrically connected with the control signal input of the control signal input of analog switch unit, program control amplification module respectively.
As Fig. 2-shown in Figure 5, described staving is made of the folded from top to bottom system of nine pcb boards 2, and wherein the middle part of Shang Mian eight pcb boards 2 offers the circular hole 3 that diameter is 75mm respectively; Isolate with the annular silica gel sealing pad 5 that is arranged on annular insulating cell 4 upper and lower anchor rings by the annular insulating cell 4 around described circular hole 3 respectively between nine pcb boards 2, the circular hole 3 that centers on the pcb board 2 of top layer is stacked with Gask-O-Seal 6 and annular lucite insulating cell 7; Nine pcb boards 2 connect as one by the bolt 8 that runs through its plate face; For increasing the effective contact area of electrode, the diameter of described annular insulating cell 4, annular silica gel sealing pad 5, sealing gasket 6 and annular lucite insulating cell 7 is greater than described circular hole 3 diameter 3mm; Circular hole 3 side faces at every pcb board 2 evenly are arranged at intervals with 128 electrodes to constitute described electrode unit, and the gap between the adjacent electrode is 0.4mm; Each electrode constitutes by being fixed on the Copper Foil 9,10 of these pcb board 2 circular holes along the corresponding position of upper and lower plate face, and upper and lower Copper Foil 9,10 is electrically connected by via hole 11; Realize being electrically connected of control circuit by pricking with needle row female 12 disposed thereon between the upper and lower pcb board 2, simultaneously, pricking with needle row female 12 also plays a supporting role.
Operation principle of the present invention is as follows:
As Fig. 1, shown in Figure 6, (among Fig. 6, being coated with black electrode is the electrode that applies AC signal, is not coated with black electrode for not applying AC signal; Solid line is the electric current line, and dotted line is an isopotential line).Every layer of electrode unit is made of 128 electrodes 1, and eight layers of electrode unit be totally 1024 electrodes 1; Each electrode 1 is electrically connected with source driving signal by the analog switch in the analog switch unit respectively, finishes electrode rotation, polarity conversion, current sample, voltage sample under the programmable gate array chip controls.Drive signal and 32 counter electrode that are symmetrical in the center of circle in every layer of electrode unit are applied AC signal through analog switch unit, under programme-control, successively 16 * 8 resistance R in centre of the negative pole (earth terminal) that applies the electrode that drives signal are carried out voltage measurement to finish the indirect current sampling by analog switch unit; Do not carry out the current potential sampling to applying 16 * 8 electrodes in centre that drive signal simultaneously.
After sampling is finished, under programme-control, pass through analog switch unit, make 32 * 8 pairs of electrodes that apply the driving signal by counterclockwise rotating an electrode position (promptly rotating 2.8125 °), simultaneously, 32 * 8 pairs do not apply the electrode that drives signal and rotate an electrode position (promptly rotating 2.8125 °) by counter clockwise direction yet, thereby realize the electrode rotation on electric, repeat above-mentioned sampling process then and can obtain 32768 data until rotating a circle.
Claims (3)
1. multi-electrode electrical impedance tomography data collecting system, comprise source driving signal, analog switch unit, drum electrode model, the current sample module, the voltage sample module, program control amplification module, real effective modular converter, the A/D modular converter, the programmable gate array chip, FLASH memorizer, synchronous dynamic random access memory; It is characterized in that: eight layers of electrode unit that described drum electrode model is horizontally set on the described staving insulation inwall by staving, from top to bottom constitute; Every layer of electrode unit all has 128 electrode gap to arrange setting; Each electrode in described every layer of electrode unit is electrically connected with described source driving signal by the analog switch in the described analog switch unit respectively; Described current sample module, voltage sample module are made of the sampling resistor on each electrode that is connected electrically in every layer of electrode unit, and the other end of described each sampling resistor is electrically connected with analog switch in the analog switch unit; The sampled signal of current sample module, voltage sample module respectively behind described program control amplification module, real effective modular converter and A/D modular converter by described programmable gate array chip-stored in the FLASH memorizer; The control signal output ends of programmable gate array chip is electrically connected with the control signal input of the control signal input of analog switch unit, program control amplification module respectively.
2. multi-electrode electrical impedance tomography data collecting system according to claim 1 is characterized in that: described staving is made of the folded from top to bottom system of nine pcb boards (2), and wherein the middle part of Shang Mian eight pcb boards (2) offers circular hole (3) respectively; Isolate by annular insulating cell (4) that centers on described circular hole (3) and the annular silica gel sealing pad (5) that is arranged on the upper and lower anchor ring of annular insulating cell (4) respectively between nine pcb boards (2), the circular hole (3) that centers on the pcb board (2) of top layer is stacked with Gask-O-Seal (6) and annular lucite insulating cell (7); Nine pcb boards (2) connect as one by the bolt (8) that runs through its plate face; The diameter of described annular insulating cell (4), annular silica gel sealing pad (5), sealing gasket (6) and annular lucite insulating cell (7) is greater than the diameter of described circular hole (3); Circular hole (3) side face in every pcb board (2) evenly is arranged at intervals with 128 electrodes to constitute described electrode unit.
3. multi-electrode electrical impedance tomography data collecting system according to claim 2, it is characterized in that: each electrode on the described every pcb board constitutes by being fixed on the Copper Foil (9,10) of this pcb board (2) circular hole along the corresponding position of upper and lower plate face, and upper and lower Copper Foil (9,10) is electrically connected by via hole (11); Be electrically connected by pricking with needle row female (12) disposed thereon between the upper and lower pcb board (2).
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101423940A CN102274025B (en) | 2011-05-30 | 2011-05-30 | Multi-electrode electrical impedance tomography data acquisition system |
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| CN2011101423940A CN102274025B (en) | 2011-05-30 | 2011-05-30 | Multi-electrode electrical impedance tomography data acquisition system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102707695A (en) * | 2012-06-08 | 2012-10-03 | 思澜科技（成都）有限公司 | Switching system for electrical impedance tomography |
| CN102894961A (en) * | 2012-10-30 | 2013-01-30 | 中国人民解放军第四军医大学 | Electrical impedance tomography method of self-structuring background frame |
| CN103228104A (en) * | 2013-02-27 | 2013-07-31 | 思澜科技（成都）有限公司 | Single-out-multiple switching circuit PCB (printed circuit board) of electrical impedance tomography serial data acquisition system |
| CN104287730A (en) * | 2013-01-25 | 2015-01-21 | 周明勇 | Detection design method for electrical impedance imaging |
| CN106840475A (en) * | 2017-03-21 | 2017-06-13 | 河北工业大学 | A kind of pliable pressure sensor-based system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040130338A1 (en) * | 2000-12-30 | 2004-07-08 | Mi Wang | Electrical impedance tomography |
| CN201223391Y (en) * | 2008-04-15 | 2009-04-22 | 中国医学科学院生物医学工程研究所 | Electrode design for electric impedance tomography imaging simulated experiment device |
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2011
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040130338A1 (en) * | 2000-12-30 | 2004-07-08 | Mi Wang | Electrical impedance tomography |
| CN201223391Y (en) * | 2008-04-15 | 2009-04-22 | 中国医学科学院生物医学工程研究所 | Electrode design for electric impedance tomography imaging simulated experiment device |
Non-Patent Citations (2)
| Title |
|---|
| 《中国医学物理学杂志》 20070331 胡小波等 一种乳腺电阻抗断层成像模型的建立 第150-152页 1-3 第24卷, 第2期 * |
| 《传感器与微系统》 20100930 赵立平等 128电极电阻抗断层成像数据采集系统设计 第83-85页 1-3 第29卷, 第9期 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102707695A (en) * | 2012-06-08 | 2012-10-03 | 思澜科技（成都）有限公司 | Switching system for electrical impedance tomography |
| CN102707695B (en) * | 2012-06-08 | 2014-05-07 | 思澜科技（成都）有限公司 | Switching system for electrical impedance tomography |
| CN102894961A (en) * | 2012-10-30 | 2013-01-30 | 中国人民解放军第四军医大学 | Electrical impedance tomography method of self-structuring background frame |
| CN102894961B (en) * | 2012-10-30 | 2014-04-09 | 中国人民解放军第四军医大学 | Electrical impedance tomography method of self-structuring background frame |
| CN104287730A (en) * | 2013-01-25 | 2015-01-21 | 周明勇 | Detection design method for electrical impedance imaging |
| CN103228104A (en) * | 2013-02-27 | 2013-07-31 | 思澜科技（成都）有限公司 | Single-out-multiple switching circuit PCB (printed circuit board) of electrical impedance tomography serial data acquisition system |
| CN103228104B (en) * | 2013-02-27 | 2018-01-09 | 思澜科技（成都）有限公司 | The on-off circuit PCB of electrical impedance tomography serial data collection system multiselect 1 |
| CN106840475A (en) * | 2017-03-21 | 2017-06-13 | 河北工业大学 | A kind of pliable pressure sensor-based system |
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| CN102274025B (en) | 2012-11-28 |
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