Electrode Circuits for Frequency- and Code-Division Multiplexed Impedance Tomography

A. McEwan, J. Tapson, A. van Schaik, D. Holder
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引用次数: 7

Abstract

Traditional impedance tomography measurement systems make sequential four-terminal impedance measurements. Potentially faster frequency- and code-division multiplexed impedance measurement systems require that simultaneous current injection and voltage measurement take place at all terminals, making four-terminal measurements difficult. We describe an electrode interface circuit that simultaneously implements balanced current injection, and current and potential measurement, allowing four-terminal measurements on sets of multiple electrodes using these faster techniques. Circuit results show that accurate simultaneous four-terminal measurements are possible, thereby enabling faster impedance tomography systems.
频率和码分复用阻抗层析成像的电极电路
传统的阻抗层析测量系统进行顺序的四端阻抗测量。可能更快的频率和码分多路阻抗测量系统需要在所有终端同时进行电流注入和电压测量,这使得四端测量变得困难。我们描述了一个电极接口电路,同时实现平衡电流注入,电流和电位测量,允许使用这些更快的技术对多个电极集进行四端测量。电路结果表明,精确的同时四端测量是可能的,从而实现更快的阻抗层析成像系统。
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