Impedance imaging using interior and exterior measurements

Cathy A. Caldwell; Margaret Cheney; David Isaacson

doi:10.1117/12.151305

27 August 1993 Impedance imaging using interior and exterior measurements

Cathy A. Caldwell, Margaret Cheney, David Isaacson

Proceedings Volume 1887, Physiological Imaging, Spectroscopy, and Early-Detection Diagnostic Methods; (1993) https://doi.org/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.

Citation Download Citation

Cathy A. Caldwell, Margaret Cheney, and David Isaacson "Impedance imaging using interior and exterior measurements", Proc. SPIE 1887, Physiological Imaging, Spectroscopy, and Early-Detection Diagnostic Methods, (27 August 1993); https://doi.org/10.1117/12.151305

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available