The Complete Electrode Model for Imaging and Electrode Contact Compensation in Electrical Impedance Tomography

Title:
The Complete Electrode Model for Imaging and Electrode Contact Compensation in Electrical Impedance Tomography
Alternative Title:
Modeling and Electrode Contact Compensation for EIT in a Mammography Geometry
Creator:
Boverman, Greg (Author)
Kim, B. S. (Author)
Kao, Tzu-Jen (Author)
Isaacson, David (Author)
Saulnier, Gary J. (Author)
Newell, Jonathan C. (Author)
Publisher:
Bernard M. Gordon Center for Subsurface Sensing and Imaging Systems (Gordon-CenSSIS), January 01, 2007
Type of resource:
Text
Genre:
Presentations
Format:
electronic
Digital origin:
born digital
Abstract/Description:
Electrical Impedance Tomography (EIT) is an imaging modality which currently shows promise for the detection an characterization of breast cancer. A very significant problem in EIT imaging is the proper modeling of the interface between the body and the electrodes. We have found empirically that it is very difficult, in a clinical setting, to assure that all electrodes make satisfactory contact with the body. In addition, we have observed a capacitive effect at the skin/electrode boundary that is spatially heterogeneous. To compensate for these problems, we have developed a hybrid nonlinear-linear reconstruction algorithm in which we first estimate electrode surface impedances, using a Newton-type iterative optimization procedure with an analytically compute Jacobian matrix. We subsequently make use of a linearized algorithm to perform a three-dimensional reconstruction of perturbations in both contact impedances and in the spatial distributions of conductivity and permittivity. Results show that, using this procedure, artifacts due to electrodes making poor contact can be greatly reduced.
Comments:
Poster presented at the 2007 Thrust R2A Multi-View Tomography Methods Conference
Subjects and keywords:
Electrical impedance tomography
Tomography
Electrode Contact Compensation
Engineering
Permanent URL:
http://hdl.handle.net/2047/d10008810

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