Cryosurgical monitoring using electrical impedance tomography: 2D and 3D feasibility studies

David M. Otten; Gary M. Onik M.D.; Boris Rubinsky

doi:10.1117/12.476375

10 June 2003 Cryosurgical monitoring using electrical impedance tomography: 2D and 3D feasibility studies

David M. Otten, Gary M. Onik M.D., Boris Rubinsky

Author Affiliations +

Proceedings Volume 4954, Thermal Treatment of Tissue: Energy Delivery and Assessment II; (2003) https://doi.org/10.1117/12.476375
Event: Biomedical Optics, 2003, San Jose, CA, United States

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.

Citation Download Citation

David M. Otten, Gary M. Onik M.D., and Boris Rubinsky "Cryosurgical monitoring using electrical impedance tomography: 2D and 3D feasibility studies", Proc. SPIE 4954, Thermal Treatment of Tissue: Energy Delivery and Assessment II, (10 June 2003); https://doi.org/10.1117/12.476375

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