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

D. Boundary Potentials Measurements A 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 Measurements Boundary 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) results The 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) results Vds: surface potential Vdm: measured data = differential potential CME: Common Mode Electrode CGE : Central Ground Electrode Vdm data with and with CGE after Calibration

Materials and Methods System Block diagram

Future works Paper 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