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1 July 1990 Acoustically modulated electrical impedance tomography
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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.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jeremy C. Hebden and Robert A. Kruger "Acoustically modulated electrical impedance tomography", Proc. SPIE 1231, Medical Imaging IV: Image Formation, (1 July 1990);

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