Low-noise current excitation sub-system for medical EIT

Physiological Measurement
M Rafiei-Naeini, H McCann

Abstract

Electrical impedance tomography (EIT) has many potential applications in medicine. The sensitivity and spatial resolution of EIT can be enhanced significantly by increasing the measurement signal-to-noise ratio (SNR), to which a significant contribution is made by the SNR of the current excitation sub-system. In this paper we present a prototype EIT current excitation sub-system with 80 dB SNR, exploiting both digital and analogue techniques. It uses digital waveform synthesis, a 16-bit DAC and subsequent reconstruction filter, to drive an enhanced Howland current source. Detailed analysis and testing of the current sub-system are presented. Its output impedance is 10 MOmega for different load impedances, varying slowly over the frequency range from 10 kHz up to 4 MHz.

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Citations

Apr 25, 2012·Obstetrics and Gynecology International·Carolyn TamGideon Koren
Aug 26, 2014·IEEE Transactions on Biomedical Circuits and Systems·Peter J LangloisAndreas Demosthenous
Jul 16, 2013·IEEE Transactions on Biomedical Circuits and Systems·A S TuckerR J Sadleir
Dec 3, 2017·The Review of Scientific Instruments·K F MorcellesV C Vincence
Sep 3, 2017·The Review of Scientific Instruments·Yunjie Yang, Jiabin Jia
Oct 2, 2017·The Review of Scientific Instruments·Bing HanFeng Dong
Sep 7, 2018·The Review of Scientific Instruments·M Khalighi, M Mikaeili
Mar 6, 2019·The Review of Scientific Instruments·Vinicius Grando SirtoliPedro Bertemes-Filho
Aug 3, 2017·The Review of Scientific Instruments·S Fernandez Santos, P Bertemes-Filho
Dec 19, 2018·Journal of Electrical Bioimpedance·Vinicius G SirtoliVolney C Vincence

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