Contributed EIT Data:

Authors: Yasheng Maimaitijiang, Stephan Böhm, Pascal O. Gaggero, Andy Adler
Date: 2011
Brief Description:

We aim to produce a standard test methodology to evaluate and compare the performance of an EIT hardware system and image reconstruction. To be part of our collaborative project, suggestions regarding efficiently evaluate system performance are all welcome. The tutorial includes overview of phantom based EIT performance evaluation, code, data and image analysis.

License: GNU GPL version 2 or version 3 at your choice.
Attribution Requirement: Users of this system are requested to acknowledge Maimaitijiang Yasheng, and reference this publication:
    Yasheng Maimaitijiang, Stephan Böhm, Obaydah Jaber, Andy Adler, "A phantom based system to evaluate EIT performance" Int. Conf. Electrical Bio-Impedance & Electrical Impedance Tomography Gainville, Fl, USA, 4-8 April 2010

Contributed Files:
   Files: Description
avar.m Calculate Allan Variance (code available from here)
data_analysis.m Analyse data for SNR and Accuracy
drift_analysis.m Analyse data for drift
image_analysis.m Analyse data for image reconstruction performance
recip_err.m Calculate reciprocity error
U2plateau.m Convert from "U-shape" to "plateau" data ordering
main.m Main function to call others and plot data
sim_2D_params.m Example in 2D
sim_Det_3D.m Example in 3D Zip file (containing all above files)

Usage Examples
Related Publications:

All software components are made publicly available and short tutorials are provided regarding evaluation and algorithm. In order to run the code, users are required to install and start the EIDORS. There are two separate systems namely the position controller and the EIT measurement system evaluation. Position controller is placed under part of contrib_data section under eidors. This section is a guide to performance evaluation algorithm.

1.Test requirement:
  • The test methodology and tests should be reproducible
  • Phantom should represent a 3D tank
  • Full cables to be used during the evaluation
  • Electrical layouts and analysis software should be publicly available
2.Intended users:
  • EIT system users to check EIT system degradation/improvements or compare different systems
  • Hardware developers to test hardware improvement
  • Software developers to test their new algorithms
3.Test phantoms: A test phantom is essential to be able to evaluate and compare the performance of a system
  • Physical phantom (cubic conductive or non-conductive test targets) with size of (50 ml and 100 ml)
  • 3D tank filled with saline water
4.Test protocol
  • Empty tank measurement used for analyzing noise characteristics of an EIT system.
  • Single-object measurement: Horizontal movement in central and off plane,
  • Two-object measurement: 2 objects moving away each other from the centre of the tank - horizontal movement in central plane
5.Performance parameters
  • data analysis for Noise performance test
    • SNR
    • Accuracy
    • Drift
    • Errors associated with symmetric measurement electrodes
  • image analysis for tests of imaging accuracy
    • Amplitude response (AR)
    • Position error (PE)
    • Resolution (RES)
    • Shape deformation (SD)
    • Ringing (RNG)
  • Tests of detectability and distinguishability
6. Image of system (including a lego™ robot position controller)

Last Modified: $Date: 2017-02-28 13:12:08 -0500 (Tue, 28 Feb 2017) $ by $Author: aadler $