A Broadband System for Multifrequency Static Imaging in Electrical Impedance Tomography

Pere J. Riu, Javier Rosell, Albert Lozano-Nieto, Ramon Pallâs-Areny

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

A widely accepted method for static Imaging in electrical impedance tomography (BIT) is to measure at two frequencies. The choice of measurement frequencies is application-dependent because some different tissues cannot be distinguished when using two fixed frequencies. We have developed a system that generates signals from 8-103 kHz and applies two of these signals simultaneously to the body through a broadband current mirror. Great care has been taken in the design of the current injection multiplexer in order to keep the current source output capacitance as low as possible. Furthermore design of the layout of the patient interface board, in order to reduce feedthrough capacitances, also needs great care. Other parameters for driving and detection sections have been designed according to our results from FEM and circuit simulations including skin and electrode effects. Simulations using FEM with available tissue impedance data and preliminary measurements in a discrete phantom show that static imaging is possible for both the real and imaginary parts of the impedance.

Original languageEnglish (US)
Pages (from-to)61-65
Number of pages5
JournalClinical Physics and Physiological Measurement
Volume13
DOIs
StatePublished - Dec 1 1992

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Acoustic impedance
Electric Impedance
Tomography
Capacitance
Tissue
Imaging techniques
Finite element method
Circuit simulation
Skin
Mirrors
Electrodes
Injections

All Science Journal Classification (ASJC) codes

  • Biophysics

Cite this

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abstract = "A widely accepted method for static Imaging in electrical impedance tomography (BIT) is to measure at two frequencies. The choice of measurement frequencies is application-dependent because some different tissues cannot be distinguished when using two fixed frequencies. We have developed a system that generates signals from 8-103 kHz and applies two of these signals simultaneously to the body through a broadband current mirror. Great care has been taken in the design of the current injection multiplexer in order to keep the current source output capacitance as low as possible. Furthermore design of the layout of the patient interface board, in order to reduce feedthrough capacitances, also needs great care. Other parameters for driving and detection sections have been designed according to our results from FEM and circuit simulations including skin and electrode effects. Simulations using FEM with available tissue impedance data and preliminary measurements in a discrete phantom show that static imaging is possible for both the real and imaginary parts of the impedance.",
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A Broadband System for Multifrequency Static Imaging in Electrical Impedance Tomography. / Riu, Pere J.; Rosell, Javier; Lozano-Nieto, Albert; Pallâs-Areny, Ramon.

In: Clinical Physics and Physiological Measurement, Vol. 13, 01.12.1992, p. 61-65.

Research output: Contribution to journalArticle

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