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A phantom for assessing the performance of EIT systems Herv Gagnon1

Summary: 1

A phantom for assessing the performance of EIT systems
Hervé Gagnon1
, Alzbeta E. Hartinger1
, Andy Adler2
and Robert Guardo1

1. Institut de génie biomédical, École Polytechnique de Montréal, Montréal, H3T 1J4, Canada
2. Dept. of Systems and Computer Engineering, Carleton University, Ottawa, K1S 5B6, Canada
This paper describes a phantom built from 340 precision resistors on a printed circuit board
(PCB) representing a circular homogeneous medium. Compared to other phantoms in the litera-
ture, this phantom generates very realistic signals while preserving the ability to produce local-
ized perturbations for testing the imaging capabilities of an EIT system. Equivalent electrical
models of the Ag/AgCl electrode impedances were integrated to the phantom. Parameters of the
electrode models were fitted from impedance curves measured with an impedance analyzer. The
technique used to build this phantom is general and applicable to phantoms of arbitrary shape
and conductivity distribution. Assessing the performance of EIT systems usually requires a phan-
tom for validation, calibration or comparison purposes. We describe some tests that can be per-
formed with our phantom to measure signal-to-noise ratio, accuracy and modelling accuracy for


Source: Adler, Andy - Department of Systems and Computer Engineering, Carleton University


Collections: Computer Technologies and Information Sciences