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A D-bar method for imaging admittivity in 2D by Electrical Impedance Tomography.

Grant number: 08/08739-7
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): January 01, 2009
Effective date (End): March 31, 2012
Field of knowledge:Engineering - Biomedical Engineering - Bioengineering
Principal Investigator:Raul Gonzalez Lima
Grantee:Claudia Natalia Lara Herrera
Home Institution: Escola Politécnica (EP). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated research grant:01/05303-4 - New strategies in artificial ventilation: diagnosis and prevention of barotrauma/biotrauma through electrical impedance tomography (EIT), AP.TEM


It is proposed an extension of the D-bar method of Electrical Impedance Tomography (EIT) for obtaining, as well as the conductivity, the permittivty between a 2D domain. The algorithm is based on the constructive uniqueness proof by Brown e Uhlmann (Comm. in PDEs, 22, 1997) for once-differentiable conductivities and extended to include unique determination and reconstruction of the permittivity by E. Francini (Inverse problems, 16, 2000). The reconstruction algorithm is tested on numerical and experimental data, collected on a pairwise electrical current injection system. The obtained images of conductivity and permittivity are compared. The characterization of biological tissues is strongly facilitated by the knowledge of permittivity. In the medical applications of EIT there is great interest in the permittivity once various authors present criteria for distinguishing healthy tissues of tissues with abnormal growth based on the permittivity.

Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
HERRERA, CLAUDIA N. L.; VALLEJO, MIGUEL F. M.; MUELLER, JENNIFER L.; LIMA, RAUL G. Direct 2-D Reconstructions of Conductivity and Permittivity From EIT Data on a Human Chest. IEEE TRANSACTIONS ON MEDICAL IMAGING, v. 34, n. 1, p. 267-274, JAN 2015. Web of Science Citations: 11.
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
HERRERA, Claudia Natalia Lara. Um método D-bar para estimar admitividade em 2-D através de tomografia por impedância elétrica.. 2012. Doctoral Thesis - Universidade de São Paulo (USP). Escola Politécnica São Paulo.

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