ScouseTom EIT System

The ScouseTom is versatile Electrical Impedance Tomography (EIT) system. It comprises a commercial current source Keithley 6221 and EEG amplifiers e.g. Biosemi or the actiCHamp, alongside custom switching/control circuitry and software.

Making a ScouseTom

If you are interested in making a ScouseTom EIT system, please create an issue in the repo or email us, we would love to help you!

Checklist

• Keithley 6221 Current source
• EEG system with sufficient bandwidth. The Biosemi and actiCHamp have been used so far, and likely the gtec or the Open-Ephys will work too
• Matlab - needed for processing anyway. Control the system using the Matlab code here
• Arduino Due For the controller
• Arduino Switch Board This controls the current source and the timing of switching current injection pairs
• Switch Network At least one, each for 37 channels. This connects the current source to the EEG system and the electrodes

Citing this work

Please cite the journal article found here

Avery, J., Dowrick, T., Faulkner, M., Goren, N. and Holder, D., 2017.
A Versatile and Reproducible Multi-Frequency Electrical Impedance Tomography System.
Sensors, 17(2), p.280.

Processing the data

To process the data you collect with this system, use the code found in this repo

Creating EIT images

Requires a forward model, generated by the code here, and the reconstruction code here to create the images

Keithley settings

Set on the front panel under comm, change BAUD to 57.2k and Terminator to <CR+LF>