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Cryosurgical monitoring using bioimpedance measurements-a feasibility study for electrical impedance tomography

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2 Author(s)
Otten, D.M. ; Dept. of Mech. Eng., California Univ., Berkeley, CA, USA ; Rubinsky, B.

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, the authors explore cryosurgical monitoring as a previously uninvestigated application for EIT. The feasibility of bio-impedance measurements to detect ice front propagation is demonstrated by freezing planar tissue samples one-dimensionally while measuring impedance along a linear array. The experimental results compare favorably to a simple finite element model designed to provide an electrical field visualization tool.

Published in:

Biomedical Engineering, IEEE Transactions on  (Volume:47 ,  Issue: 10 )

Date of Publication:

Oct. 2000

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