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Gradient-based electrical conductivity imaging using MR phase.

Necip Gurler1, Yusuf Ziya Ider1

  • 1Department of Electrical and Electronics Engineering, Bilkent University, Ankara, Turkey.

Magnetic Resonance in Medicine
|January 15, 2016
PubMed
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A novel electrical conductivity imaging method based on MR transceive phase was developed. This new method is faster, more robust to noise, and artifact-free, improving clinical diagnoses and specific absorption rate estimation.

Keywords:
MREPTboundary artifactconductivityphase based

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Area of Science:

  • Medical Imaging
  • Biophysics
  • Electrical Engineering

Background:

  • Electrical conductivity imaging provides crucial information for medical diagnoses.
  • Existing phase-based electrical properties tomography (EPT) methods face limitations with boundary artifacts and noise robustness.

Purpose of the Study:

  • To develop a fast, practical, and boundary artifact-free electrical conductivity imaging method.
  • To enhance robustness against noise in electrical conductivity imaging.
  • To propose a method not reliant on the transceive phase assumption.

Main Methods:

  • Derived a new formulation based on Maxwell's equations, incorporating conductivity gradients.
  • Solved the governing convection-reaction-diffusion equation using a 3D finite-difference scheme.
  • Validated the method through numerical simulations, phantom, and in vivo human experiments at 3T.

Main Results:

  • The proposed method demonstrated superiority over conventional phase-based EPT.
  • Improved performance was observed, particularly in transition regions and with noisy data.
  • Simulation and experimental results confirmed the method's effectiveness.

Conclusions:

  • The developed method offers a fast and reliable approach to electrical conductivity imaging.
  • This advancement holds promise for improved clinical diagnoses.
  • Potential applications include accurate local specific absorption rate (SAR) estimation.