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Published on: November 8, 2018
Conductivity imaging of canine brain using a 3 T MREIT system: postmortem experiments
Hyung Joong Kim1, Byung Il Lee, Young Cho
1College of Electronics and Information, Kyung Hee University, Korea.
Physiological Measurement
|November 6, 2007
Summary
Magnetic Resonance Electrical Impedance Tomography (MREIT) successfully imaged canine brains, revealing conductivity differences between white and gray matter. This technique shows promise for high-resolution in situ tissue conductivity mapping.
Area of Science:
- Biomedical Imaging
- Electrical Impedance Tomography
- Neuroscience
Background:
- Magnetic Resonance Electrical Impedance Tomography (MREIT) offers potential for high-resolution conductivity imaging.
- Previous phantom studies demonstrated MREIT's spatial resolution capabilities with sufficient current injection.
Purpose of the Study:
- To generate high-resolution in situ conductivity images of canine brain white and gray matter using MREIT.
- To refine experimental techniques for future in vivo animal studies.
Main Methods:
- MREIT was applied to postmortem canine brains utilizing 40 mA injection currents.
- Reconstructed conductivity images were analyzed for conductivity contrast and ratios between tissue types.
- White matter anisotropy was considered in interpreting conductivity values.
Main Results:
- High-resolution conductivity images (1.4 x 1.4 mm(2) pixels) clearly distinguished gray and white matter.
- Estimated white matter to gray matter conductivity ratios ranged from 1.13 to 1.20.
- Higher white matter conductivity was attributed to fiber-parallel conductivity.
Conclusions:
- Postmortem MREIT imaging provides valuable in situ conductivity information for canine brains.
- The findings support MREIT's utility for tissue conductivity mapping and potential applications in modeling studies.
- This study advances techniques for future in vivo MREIT investigations.
