Current density impedance imaging.
Published: 2004
Language: eng
Number of pages: 80
Description: Current density impedance imaging (CDII) is a technique that allows non-invasive measurement of sample conductivity.The conventional Electrical Impedance Tomography (EIT) technique suffers from the ill-posedness of this inverse problem. It tries to recover internal conductivity from surface potential and current measurements, which causes the sensitivity to decrease in deeper regions.Numerical simulations have shown the validity and robustness of this technique.It has been proven that if two non-parallel current flows can be determined within the same conductive region, the information is sufficient to recover the relative conductivity. Our method, current density impedance imaging (CDII) uses two current density distributions to calculate the value of &nabla;lnsigma. Furthermore, combined with a quality-guided line integral algorithm, CDII can calculate the internal conductivity from this &nabla;lnsigma. This technique is a non-invasive way of detecting conductivity changes, and also an effective quasi-local approach to circumvent regions with either low MRI signal or high susceptibility.
Notes: Advisers:  Michael L. G. Joy; Adrian I. Nachman.

Thesis (M.A.Sc.)--University of Toronto, 2004.

Electronic version licensed for access by U. of T. users.

Source: Masters Abstracts International, Volume: 43-03, page: 0903.

MICR copy on microfiche (1 microfiche).