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Related Concept Videos

Brain Imaging01:14

Brain Imaging

Brain imaging technologies provide critical insights into both the structure and function of the human brain, enabling medical professionals and researchers to diagnose, study, and treat neurological disorders or psychiatric disorders more effectively.
These technologies include computerized axial tomography (CAT or CT scans), positron-emission tomography (PET scans),  magnetic resonance imaging (MRI),  functional magnetic resonance imaging (fMRI), and Transcranial Magnetic Stimulation (TMS).

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Mapping functional connectivity in patients with brain lesions.

Adrian G Guggisberg1, Susanne M Honma, Anne M Findlay

  • 1Biomagnetic Imaging Lab, Department of Radiology, University of California San Francisco, San Francisco, CA 94143-0628, USA. aguggis@gmail.com

Annals of Neurology
|September 27, 2007
PubMed
Summary

Magnetoencephalography reveals brain functional connectivity. Resting state coherence mapping aids in understanding brain lesions and planning surgeries for patients with brain damage.

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Area of Science:

  • Neuroscience
  • Brain Imaging
  • Functional Connectivity

Background:

  • The spatial distribution of functional connectivity and its disturbance by focal brain lesions are not well understood.
  • Damaged brain tissue may become disconnected from healthy brain areas.
  • Mapping brain functionality based on connectivity is crucial.

Purpose of the Study:

  • To map brain area functionality by assessing their connectivity with other areas.
  • To investigate the impact of focal brain lesions on functional connectivity.

Main Methods:

  • Magnetoencephalography (MEG) recordings of resting-state cortical activity from patients with focal brain lesions and healthy controls.
  • Estimation of neural activity using adaptive spatial filtering.
  • Calculation of mean imaginary coherence between brain voxels as a functional connectivity index.

Main Results:

  • Highest alpha frequency coherence observed in healthy subjects' critical areas (somatosensory, language cortices).
  • Lesion patients exhibited diffuse or scattered areas of decreased alpha coherence compared to controls.
  • Decreased connectivity in lesion-affected areas correlated with neurological deficits; resectable areas in tumor patients without deficits showed reduced coherence.

Conclusions:

  • Resting-state coherence measured by MEG effectively maps brain functional connectivity.
  • This method provides valuable information for planning resective surgeries in brain lesion patients.
  • It also aids in investigating structural-functional relationships in healthy individuals.