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 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
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 16Electrode Phantom ” 5th Annual IEEE Conference on
Automation Science and Engineering Bangalore,
India, August 22-25, 200
Thank you for your
attention