What is it about?

Current source is the key core in bioimpedance systems for accurately investigate tissue behavior. We have demonstrated that a higher accuracy of current source can be achieved by implementing a close loop control. This improved current source can be used together with multiplexer used in electrical impedance tomography by resulting in a wider applications and this might improve the accuracy of the reconstructed images.

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Why is it important?

Our results showed that it is possible to increase the performance in current source used in multiplexed system, such as in electrical impedance tomography (EIT). Thus, the quality of the EIT images can be better generated into comparison of using other type of current source as a excitation source.


It is very difficult to decide which current excitation gives the better expected performance. It is a simple idea and feasible to be built in a short period of time. The use of multiplexer sometimes cannot be avoided. I hope that this article may help the designer of electrical impedance tomagraphs when selecting the excitation source of the project.

Dr Pedro Bertemes-Filho
Universidade do Estado de Santa Catarina

Read the Original

This page is a summary of: Mirrored enhanced Howland current source with feedback control, Review of Scientific Instruments, February 2019, American Institute of Physics,
DOI: 10.1063/1.5079872.
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