S Armstrong and D Jennings 2004 Physiol. Meas. 25 797 doi:10.1088/0967-3334/25/4/001
S Armstrong and D Jennings
Show affiliationsCurrent conveyors have been identified as a possible component within the current injection electrodes of an electrical impedance tomography system, where accurate current generation or precise measurement of the current injected is required. Several circuit configurations have been investigated through simulation to determine the most suitable to meet the specifications of the EIT system. A bipolar (floating source) circuit configuration employing the use of current conveyors has been designed, which achieves greater than 12 mA output current without saturation, over an accepted body impedance range. Simulations were performed over frequencies in excess of 1 MHz, and the output phase shift was less than 0.15° up to 250 kHz, and 0.6° up to 1 MHz.
87.63.Pn Electrical impedance tomography (EIT)
87.80.-y Biophysical techniques (research methods)
87.19.R- Mechanical and electrical properties of tissues and organs
Issue 4 (August 2004)
Received 29 December 2003, accepted for publication 25 March 2004
Published 22 July 2004
S Armstrong and D Jennings 2004 Physiol. Meas. 25 797
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