Electrical impedance tomography. Electrode current determination from programmable voltage sources.
The accuracy requirements for adaptive current electrical impedance tomography (EIT) measurements exceed the capability of available current sources. A new architecture for an EIT system is described in which the electrode current is set indirectly from a voltage-drive structure. A numerically inverted admittance matrix, obtained from current measurements and driving voltages, has been used to achieve the desired current pattern from programmable voltage sources.
Lidgey
F J
FJ
Electrical Impedance Tomography Research Group, Oxford Polytechnic, Headington, UK.
Zhu
Q S
QS
McLeod
C N
CN
Breckon
W R
WR
D004553:Electric Conductivity; D006801:Humans; D014054:Tomography / Q000379:methods*