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Summary: Adjacent Stimulation and Measurement Patterns
Considered Harmful
Andy Adler1
, Pascal O. Gaggero2
, Yasheng Maimaitijiang1
1
Systems and Computer Engineering, Carleton University, Ottawa, Canada 2
Centre
suisse d'electronique et de microtechnique (CSEM), Landquart, Switzerland
E-mail: {adler,mamatjan}@sce.carleton.ca, pascal.gaggero@csem.ch
Abstract. We characterize the ability of electrical impedance tomography (EIT) to
distinguish changes in internal conductivity distributions, and analyze it as a function
of stimulation and measurement patterns. A distinguishability measure, z, is proposed
which is related to the signal to noise ratio of a medium and to the probability
of detection of conductivity changes in a region of interest. z is a function of the
number of electrodes, the EIT stimulation and measurement protocol, the stimulation
amplitude, the measurement noise, and the size and location of the contrasts. Using
this measure we analyze various choices of stimulation and measurement patterns under
the constraint of medical electrical safety limits (maximum current into the body).
Analysis is performed for a planar placement of 16 electrodes for simulated 3D tank and
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