Aspects of instrumentation design for impedance imaging.


This paper takes the circuit for a general purpose impedance imaging data measurement system and analyses the importance of several components. For high accuracy it is shown that stray capacitances in the input circuitry are the major problem although the use of a phase sensitive demodulator can minimise this problem. It is shown that harmonic distortion in the constant current generator can cause errors which are, however, reduced if a linear multiplying demodulator is used rather than a switching demodulator.

Cite this paper

@article{Murphy1988AspectsOI, title={Aspects of instrumentation design for impedance imaging.}, author={Darcy Murphy and Peter Rolfe}, journal={Clinical physics and physiological measurement : an official journal of the Hospital Physicists' Association, Deutsche Gesellschaft für Medizinische Physik and the European Federation of Organisations for Medical Physics}, year={1988}, volume={9 Suppl A}, pages={5-14} }