Improved methods to determine optimal currents in electrical impedance tomography

Author

Hua, Ping ; Woo, Eung Je ; Webster, John G. ; Tompkins, Willis J.

Author_Institution

Dept. of Electr. & Comput. Eng., Wisconsin Univ., Madison, WI, USA

Volume

11

Issue

4

fYear

1992

fDate

12/1/1992 12:00:00 AM

Firstpage

488

Lastpage

495

Abstract

An electrical impedance tomography (EIT) system that uses the optimal current method to inject currents and the regularized Newton-Raphson algorithm to reconstruct an image of resistivity distribution is discussed. Iterative methods to derive the optimal current patterns through iterative physical measurements are developed. Direct methods to first determine the resistance matrix of a resistivity distribution through a set of current bases is injected and the measured voltage responses are stored. This permits iterative reconstruction techniques to operate on the stored data without requiring lengthy data taking from the object and reduces the effects of motion artifacts. The direct methods have superior performance as compared to the iterative methods in both optimal current and voltage generation. The results obtained with three sets of current bases are studied

Keywords

electric impedance imaging; current injection; electrical impedance tomography; iterative physical measurements; measured voltage responses; medical diagnostic imaging; motion artifacts; optimal currents determination method; regularized Newton-Raphson algorithm; resistance matrix; resistivity distribution image reconstruction; Conductivity; Current measurement; Electric resistance; Electrical resistance measurement; Image reconstruction; Impedance; Iterative algorithms; Iterative methods; Tomography; Voltage;

fLanguage

English

Journal_Title

Medical Imaging, IEEE Transactions on

Publisher

ieee

ISSN

0278-0062

Type

jour

DOI

10.1109/42.192684

Filename

192684