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Proceedings Paper

Acoustically modulated electrical impedance tomography
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Paper Abstract

The feasibility of a new diagnostic imaging technique is investigated that potentially might be used for breast cancer screening with millimeter resolution, but without using ionizing radiation. It is suggested that acoustic pulses of sufficient intensity may produce small density changes within tissue which result in small but detectable changes in electrical current flowing through the tissue. The magnitude of this current fluctuation is shown to be inversely proportional to the conductivity of the tissue within the region occupied by the pulse. Measurement of the current modulation may enable small resistive inhomogeneities, such as tumors, to be detected. If the position of a pulse's wavefront can be predicted with sufficient precision at any given instant, measurement of the current modulation could be used to reconstruct the unknown electrical impedance distribution within the tissue. The rudiments of the technique are discussed and, using some simplifying assumptions, a rough estimate is made of the magnitude of the current modulation, and of the timescale necessary to obtain useful diagnostic information.

Paper Details

Date Published: 1 July 1990
PDF: 8 pages
Proc. SPIE 1231, Medical Imaging IV: Image Formation, (1 July 1990); doi: 10.1117/12.18778
Show Author Affiliations
Jeremy C. Hebden, Univ. of Utah School of Medicine (United States)
Robert A. Kruger, Univ. of Utah School of Medicine (United States)

Published in SPIE Proceedings Vol. 1231:
Medical Imaging IV: Image Formation
Roger H. Schneider, Editor(s)

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