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Proceedings Paper

Electrical Impedance Imaging Of The Body With Nonlinear Reconstruction
Author(s): Yongmin Kim; Willis J. Tompkins; John G. Webster
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Paper Abstract

In this paper, we survey existing various impedance techniques and we propose to develop a new imaging technology, computerized impedance tomography (CIT),for imaging the thorax. By applying high-frequency current and measuring its distribution, it should be possible to reconstruct the impedance images of the body noninvasively and nondestructively for the frontal plane, the transverse plane, and eventually three dimensions. We overcome difficulties in the reconstruction procedure due to nonlinear and nonplanar current paths by solving Laplace's equation numerically in our model for every iteration and by using a nonlinear back-projection reconstruction algorithm to obtain the impedance image iteratively. Results of our simulation study with computer-generated phantom objects in the computer model indicate that reasonable impedance images in one transverse plane of the thorax can be obtained with 8 current projections. We discuss advantages and disadvantages associated with impedance imaging, the computer model, important variables affecting the quality of reconstructed impedance images, and back-projection algorithms used in reconstructing impedance images. We present reconstructed impedance images with 8 projection angles and different projection methods. We summarize numerical aspects, computer requirements, and limitations of impedance imaging. We also discuss the future of impedance imaging.

Paper Details

Date Published: 13 December 1983
PDF: 8 pages
Proc. SPIE 0419, Application of Optical Instrumentation in Medicine XI, (13 December 1983); doi: 10.1117/12.936037
Show Author Affiliations
Yongmin Kim, University of Washington (United States)
Willis J. Tompkins, University of Wisconsin-Madison (United States)
John G. Webster, University of Wisconsin-Madison (United States)

Published in SPIE Proceedings Vol. 0419:
Application of Optical Instrumentation in Medicine XI
Gary D. Fullerton, Editor(s)

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