Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Current dipole localization with an ideal magnetometer system

B Lütkenhöner1

  • 1Institute for Experimental Audiology, University of Münster, Germany.

IEEE Transactions on Bio-Medical Engineering
|November 1, 1996
PubMed
Summary

This study analyzes magnetoencephalography (MEG) dipole source analysis errors. We found specific correlations and error behaviors for deep dipoles, aiding in more accurate brain activity localization.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

HR 3 Tesla MRI for the diagnosis of endolymphatic hydrops and differential diagnosis of inner ear tumors--demonstrated by two cases with similar symptoms.

RoFo : Fortschritte auf dem Gebiete der Rontgenstrahlen und der Nuklearmedizin·2014
Same author

No indication of brain reorganization after unilateral ischemic lesions of the auditory cortex.

Neurology·2006
Same author

From noise to pitch: transient and sustained responses of the auditory evoked field.

Hearing research·2006
Same author

Interaction between the neuromagnetic responses to sound energy onset and pitch onset suggests common generators.

The European journal of neuroscience·2004
Same author

Sensitivity of the neuromagnetic N100m deflection to spectral bandwidth: a function of the auditory periphery?

Audiology & neuro-otology·2003
Same author

Studies of tonotopy based on wave N100 of the auditory evoked field are problematic.

NeuroImage·2003

Area of Science:

  • Biophysics
  • Neuroscience
  • Biomagnetism

Background:

  • Magnetoencephalography (MEG) is crucial for non-invasively mapping brain activity.
  • Dipole source analysis is a key technique in MEG data interpretation.
  • Understanding parameter estimation errors is vital for accurate source localization.

Purpose of the Study:

  • To investigate fundamental aspects of MEG-based dipole source analysis.
  • To derive analytical formulas for parameter estimation errors.
  • To quantitatively predict error behavior based on various system and source parameters.

Main Methods:

  • Theoretical analysis using an ideal magnetometer system measuring the radial magnetic field.
  • Derivation of analytical formulas for variances and covariances of dipole parameters.
  • Validation of formulas using Monte Carlo simulations.

Main Results:

  • Identified a negative correlation between radial coordinate and longitudinal dipole moment component.
  • Demonstrated distinct asymptotic error behaviors for deep dipoles.
  • Quantified error dependencies on dipole depth, magnetometer geometry, and signal-to-noise ratio (SNR).

Conclusions:

  • Analytical formulas provide quantitative predictions for MEG dipole source analysis errors.
  • Error characteristics differ significantly for deep dipoles, impacting localization accuracy.
  • Findings offer insights into optimizing MEG systems and analysis for improved brain activity mapping.

Related Experiment Videos