Paper: Sep 12,2024
q-bio.QM
ID:2409.07806
Investigation of Electrical Conductivity Changes during Brain Functional Activity in 3T MRI
Blood oxygenation level-dependent (BOLD) functional magnetic resonance
imaging (fMRI) is widely used to visualize brain activation regions by
detecting hemodynamic responses associated with increased metabolic demand.
While alternative MRI methods have been employed to monitor functional
activities, the investigation of in-vivo electrical property changes during
brain function remains limited. In this study, we explored the relationship
between fMRI signals and electrical conductivity (measured at the Larmor
frequency) changes using phase-based electrical properties tomography (EPT).
Our results revealed consistent patterns: conductivity changes showed negative
correlations, with conductivity decreasing in the functionally active regions
whereas B1 phase mapping exhibited positive correlations around activation
regions. These observations were consistent across both motor and visual cortex
activations. To further substantiate these findings, we conducted
electromagnetic radio-frequency simulations that modeled activation states with
varying conductivity, which demonstrated trends similar to our in-vivo results
for both B1 phase and conductivity. These findings suggest that in-vivo
electrical conductivity changes can indeed be measured during brain activity.
However, further investigation is needed to fully understand the underlying
mechanisms driving these measurements.
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Paper Author: Kyu-Jin Jung,Chuanjiang Cui,Soo-Hyung Lee,Chan-Hee Park,Ji-Won Chun,Dong-Hyun Kim
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