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A phantom for electrical impedance tomography.

H Griffiths1

  • 1Department of Medical Physics and Bioengineering, University Hospital of Wales, Heath Park, Cardiff, UK.

Clinical Physics and Physiological Measurement : an Official Journal of the Hospital Physicists' Association, Deutsche Gesellschaft Fur Medizinische Physik and the European Federation of Organisations for Medical Physics
|January 1, 1988
PubMed
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A novel phantom for electrical impedance tomography (EIT) was created using a resistor mesh to simulate tissue properties. This allows for standardized testing of EIT systems and image reconstruction algorithms.

Area of Science:

  • Biomedical Engineering
  • Electrical Engineering
  • Medical Imaging

Background:

  • Electrical Impedance Tomography (EIT) is an imaging technique that uses electrical measurements to reconstruct images of internal conductivity and permittivity.
  • Developing accurate and reproducible phantoms is crucial for testing and validating EIT systems and algorithms.
  • Current phantoms may lack the flexibility to simulate diverse tissue properties or the stability required for rigorous testing.

Purpose of the Study:

  • To develop a novel, reproducible phantom for Electrical Impedance Tomography (EIT).
  • To simulate varying apparent electrical conductivity and permittivity within the phantom.
  • To enable standardized testing and validation of EIT systems and image reconstruction algorithms.

Main Methods:

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  • A resistor mesh soldered to a matrix board was constructed as a physical realization of a finite element model.
  • Additional resistors and capacitors were used to shunt mesh resistors, simulating different tissue electrical properties.
  • An EIT system with phase-sensitive detection was employed to measure peripheral electric potentials.
  • A recently developed algorithm was used to reconstruct conductivity and permittivity images from the measurements.

Main Results:

  • The constructed phantom demonstrated good mechanical strength and electrical stability.
  • The phantom successfully simulated changes in apparent electrical conductivity and permittivity.
  • The EIT system and reconstruction algorithm were tested using the phantom, producing conductivity and permittivity images.
  • The phantom design is easily reproducible for distribution to other research centers.

Conclusions:

  • A robust and adaptable phantom for EIT has been successfully developed.
  • The phantom facilitates standardized testing of EIT systems and algorithms.
  • This reproducible design promotes collaborative development and validation in the EIT research community.