27 August 1993 Impedance imaging using interior and exterior measurements
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Proceedings Volume 1887, Physiological Imaging, Spectroscopy, and Early-Detection Diagnostic Methods; (1993); doi: 10.1117/12.151305
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States
Abstract
Diagnosis and treatment of some disease states of the heart can be facilitated with knowledge of the electrical activity and resistivity properties within the heart muscle. A method of obtaining such information is through the use of electrical impedance tomography. Impedance imaging systems apply current patterns to the exterior of an object, measure the resulting voltages, and from these measurements construct an approximation to the spatially varying resistivity of the interior. By placing electrodes on the exterior of the heart or thorax as well as inside one of the heart chambers, using a catheter or by other means, it may be possible to construct images which reflect the resistivity distribution of the heart wall. In this work, we consider a simple model of the heart and thorax where electrodes are situated on both the interior and exterior boundaries of an annulus. The optimal current patterns to be applied are determined for the case of a homogeneous resistivity distribution and for the case of a single inhomogeneous layer. The question of the measurement precision required to distinguish between a homogeneous resistivity distribution and an inhomogeneous resistivity distribution is also discussed.
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Cathy A. Caldwell, Margaret Cheney, David Isaacson, "Impedance imaging using interior and exterior measurements", Proc. SPIE 1887, Physiological Imaging, Spectroscopy, and Early-Detection Diagnostic Methods, (27 August 1993); doi: 10.1117/12.151305; https://doi.org/10.1117/12.151305
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KEYWORDS
Heart

Electrodes

Imaging systems

Tin

Precision measurement

Tomography

Fourier transforms

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