Electrical Impedance Imaging Of The Body With Nonlinear Reconstruction

Yongmin Kim; Willis J. Tompkins; John G. Webster

doi:10.1117/12.936037

13 December 1983 Electrical Impedance Imaging Of The Body With Nonlinear Reconstruction

Yongmin Kim, Willis J. Tompkins, John G. Webster

Proceedings Volume 0419, Application of Optical Instrumentation in Medicine XI; (1983) https://doi.org/10.1117/12.936037
Event: Application of Optical Instrumentation in Medicine XI, 1983, Atlanta, United States

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.

Citation Download Citation

Yongmin Kim, Willis J. Tompkins, and John G. Webster "Electrical Impedance Imaging Of The Body With Nonlinear Reconstruction", Proc. SPIE 0419, Application of Optical Instrumentation in Medicine XI, (13 December 1983); https://doi.org/10.1117/12.936037

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