Low-noise current excitation sub-system for medical EIT

Physiological Measurement
M Rafiei-Naeini, H McCann


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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Aug 1, 1994·IEEE Transactions on Bio-medical Engineering·R D CookD Isaacson
May 1, 1994·Physiological Measurement·R BragósP Riu
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Mar 17, 2000·Physiological Measurement·P Bertemes-FilhoA J Wilson
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Aug 9, 2002·IEEE Transactions on Medical Imaging·Nick PolydoridesHugh McCann
Jun 19, 2003·Physiological Measurement·Alexander S RossD Isaacson
Aug 10, 2005·Physiological Measurement·N TerzopoulosC McLeod
Jul 14, 1967·Science·K A Klivington, R Galambos

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