title: Electrical impedance tomography. Electrode current determination from programmable voltage sources.
abstract: 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.
authors.affiliation: Electrical Impedance Tomography Research Group, Oxford Polytechnic, Headington, UK.
authors.forename: F J
authors.initials: FJ
authors.lastname: Lidgey
authors.forename: Q S
authors.initials: QS
authors.lastname: Zhu
authors.forename: C N
authors.initials: CN
authors.lastname: McLeod
authors.forename: W R
authors.initials: WR
authors.lastname: Breckon
mesh_terms: D004553:Electric Conductivity; D006801:Humans; D014054:Tomography / Q000379:methods*