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Development of a reconstruction algorithm for imaging impedance changes in the human head

Gibson, A; Bayford, RH; Holder, DS; (1999) Development of a reconstruction algorithm for imaging impedance changes in the human head. ELECTRICAL BIOIMPEDANCE METHODS: APPLICATIONS TO MEDICINE AND BIOTECHNOLOGY , 873 482 - 492.

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Abstract

Accurate imaging of impedance changes in the brain with EIT using scalp electrodes ideally requires an algorithm designed for a 3D hemispherical object that is capable of imaging through the skull. A 2D algorithm is presented, intended as the First step towards a full 3D version, It is based on a sensitivity matrix approach and allows images to be reconstructed from any electrode positions. Its performance was assessed using a 2D circular tank with a simulated skull. The findings suggested the following: if polar current drive was used with no explicit skull compensation, a feature in the image would be plated 25% closer to the center and would be around one-third the amplitude of an identical perturbation in a homogeneous medium.

Type: Article
Title: Development of a reconstruction algorithm for imaging impedance changes in the human head
Location: BARCELONA, SPAIN
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng
URI: http://discovery.ucl.ac.uk/id/eprint/66972
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