Modifying Electrical Impedance Tomography System (3)

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Presenter : Yu-Chun Hua Presenter : Yu-Chun Hua Adviser : Dr. Ji-Jer Huang Adviser : Dr. Ji-Jer Huang Date : 99.12.09 Date : 99.12.09

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Modifying Electrical Impedance Tomography System (3). Presenter : Yu-Chun Hua Adviser : Dr. Ji-Jer Huang Date : 99.12.09. D. Boundary Potentials Measurements. A 1 mA, 50 kHz constant current signal is injected to the phantom boundary - PowerPoint PPT Presentation

Transcript of Modifying Electrical Impedance Tomography System (3)

Page 1: Modifying  Electrical  Impedance Tomography System (3)

Presenter : Yu-Chun HuaPresenter : Yu-Chun Hua Adviser : Dr. Ji-Jer Huang Adviser : Dr. Ji-Jer Huang Date : 99.12.09Date : 99.12.09

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D. Boundary Potentials MeasurementsA 1 mA, 50 kHz constant current signal is injected to the phantom boundary

The surface potentials developed are measured using neighboring method of electrode switching protocol

Boundary data measurement with practical biological phantom

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D. Boundary Potentials MeasurementsBoundary potentials are also measured for a phantom with and without extra water column above and below the electrode array level.

The measured potential data are compared with the calculated potential data.

Boundary data measurement with a phantom having extra water column above and below

the electrode array level.

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Paper review(2) resultsPaper review(2) resultsThe differential potential is calculated using our forward solver with the phantom specifications provided by Ider et al

Vds Curve Compared with Ider et al Data

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Paper review(2) resultsPaper review(2) resultsVds: surface potentialVdm: measured data = differential potentialCME: Common Mode ElectrodeCGE : Central Ground Electrode

Vdm data with and with CGE after Calibration

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Materials and Methods System Block diagram

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Future worksPaper review

Build a hardware howland circuit

Modified EIT system (digital control)

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References[1] R. A. Stiz, P. Bertemes-Filho, A. Ramos, V. C. Vincence.

“Wide Band Howland Bipolar Current Source using AGC Amplifier “IEEE LATIN AMERICA TRANSACTIONS, VOL. 7, NO. 5, SEPTEMBER 2009

[2] From: Tushar Kanti Bera and J. Nagaraju ”﹐ A Simple Instrumentation Calibration Technique for Electrical Impedance Tomography (EIT) Using A 16-Electrode Phantom ” 5th Annual IEEE Conference on Automation Science and Engineering Bangalore, India, August 22-25, 200

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