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Proceedings Paper

Cryosurgical monitoring using electrical impedance tomography: 2D and 3D feasibility studies
Author(s): David M. Otten; Gary M. Onik M.D.; Boris Rubinsky
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Paper Abstract

The effectiveness of cryosurgery in treating tumors is highly dependent on knowledge of freezing extent, and therefore relies heavily on real-time imaging techniques for monitoring. Electrical impedance tomography (EIT), which utilizes tissue impedance variation to construct an image, is very well-suited to cryosurgery since frozen tissue impedance is much higher than that of unfrozen tissue. In this study, we develop numerical models to evaluate the theoretical ability of EIT to image cryosurgery. We begin in the simplified 2D arena, and then extend this line of study to the more appropriate 3D realm. Our simulated finite element phantoms and pixel-based Newton-Raphson reconstruction algorithms were able to produce easily identifiable images of frozen regions within tissue. We hope that these findings will serve as a stepping stone in developing EIT as a promising supplement to existing cryosurgical monitoring techniques.

Paper Details

Date Published: 10 June 2003
PDF: 5 pages
Proc. SPIE 4954, Thermal Treatment of Tissue: Energy Delivery and Assessment II, (10 June 2003); doi: 10.1117/12.476375
Show Author Affiliations
David M. Otten, Univ. of California, Berkeley (United States)
Gary M. Onik M.D., Celebration Health, Florida Hospital (United States)
Boris Rubinsky, Univ. of California, Berkeley (United States)

Published in SPIE Proceedings Vol. 4954:
Thermal Treatment of Tissue: Energy Delivery and Assessment II
Thomas P. Ryan, Editor(s)

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