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Computed Tomography01:10

Computed Tomography

Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...

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A DSP based multi-frequency 3D electrical impedance tomography system.

Mehran Goharian1, Manuchehr Soleimani, Aravinthan Jegatheesan

  • 1Medical Physics and Applied Radiation Sciences, McMaster University, Hamilton, ON, Canada. goharim@mcmaster.ca

Annals of Biomedical Engineering
|July 17, 2008
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Summary
This summary is machine-generated.

This study presents a multi-frequency Electrical Impedance Tomography (EIT) system capable of imaging conductivity and permittivity. The system demonstrates high signal-to-noise ratio and low error, enabling 3D imaging.

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Area of Science:

  • Biomedical Engineering
  • Electrical Engineering
  • Medical Imaging

Background:

  • Electrical Impedance Tomography (EIT) is a non-invasive imaging technique.
  • Accurate conductivity and permittivity imaging is crucial for various applications.
  • Existing EIT systems may have limitations in flexibility and frequency range.

Purpose of the Study:

  • To design and validate a flexible multi-frequency EIT system.
  • To achieve high-resolution 3D imaging of conductivity and permittivity distributions.
  • To evaluate system performance using phantoms and saline tanks.

Main Methods:

  • A multi-frequency EIT system with up to 48 electrodes was designed.
  • A digital signal processor generated sinusoidal waveforms from 0.1-125 kHz.
  • Software-based phase-sensitive demodulation, signal averaging, and automatic gain control were implemented.

Main Results:

  • The system achieved a signal-to-noise ratio > 60 dB and reciprocity error < 4%.
  • Common-mode rejection ratio was nearly 60 dB at 50 kHz.
  • 3D imaging of conductivity and permittivity distributions was demonstrated.

Conclusions:

  • The developed multi-frequency EIT system offers a flexible platform for advanced imaging.
  • The system's performance metrics indicate its suitability for various EIT applications.
  • The ability to reconstruct both conductivity and permittivity provides richer diagnostic information.