Post on 02-Jan-2016
description
Presenter : Yu-Chun HuaPresenter : Yu-Chun Hua Adviser : Dr. Ji-Jer Huang Adviser : Dr. Ji-Jer Huang Date : 99.12.09Date : 99.12.09
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
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.
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
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
Materials and Methods System Block diagram
Future worksPaper review
Build a hardware howland circuit
Modified EIT system (digital control)
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