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Related Concept Videos

Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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Magnetic Resonance Elastography Methodology for the Evaluation of Tissue Engineered Construct Growth
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Magnetic resonance driven electrical impedance tomography: a simulation study.

Michiro Negishi1, Tangji Tong, R Todd Constable

  • 1Department of Diagnostic Radiology, School of Medicine, Yale University, New Haven, CT 06520, USA. michiro.negishi@yale.edu

IEEE Transactions on Medical Imaging
|December 15, 2010
PubMed
Summary
This summary is machine-generated.

Magnetic Resonance Driven Electrical Impedance Tomography (MRDEIT) offers a novel approach to conductivity imaging by using magnetic resonance as the field source. This method overcomes limitations of traditional MREIT, enabling complex permittivity imaging.

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Area of Science:

  • Biomedical Engineering
  • Medical Imaging
  • Electromagnetism

Background:

  • Magnetic Resonance Electrical Impedance Tomography (MREIT) reconstructs conductivity distributions using magnetic resonance (MR).
  • Traditional MREIT faces technical challenges with current injection via surface electrodes, limiting applicable current levels.

Purpose of the Study:

  • To introduce Magnetic Resonance Driven Electrical Impedance Tomography (MRDEIT) as an alternative to MREIT.
  • To address the limitations of current injection in conventional MREIT.
  • To reconstruct complex permittivity images using MRDEIT.

Main Methods:

  • MRDEIT utilizes magnetic resonance within each voxel as the applied magnetic field source.
  • Resultant electromagnetic fields are measured using surface electrodes or radio-frequency (RF) detectors.
  • Analysis is based on a vector wave equation for the electric field, accounting for RF frequencies and eddy currents.

Main Results:

  • Computer simulations demonstrate the feasibility of reconstructing complex permittivity images with MRDEIT.
  • The study identified a need for enhanced signal detection to accurately measure moderate complex permittivity changes.

Conclusions:

  • MRDEIT presents a promising advancement in electrical impedance tomography by leveraging MR technology.
  • Further development in signal detection sensitivity is crucial for the clinical applicability of MRDEIT for detecting subtle conductivity variations.