Source Activity Correlation Effects on LCMV Beamformers in a Realistic Measurement Environment
المؤلفون المشاركون
Braun, Christoph
Belardinelli, Paolo
Ortiz, Erick
المصدر
Computational and Mathematical Methods in Medicine
العدد
المجلد 2012، العدد 2012 (31 ديسمبر/كانون الأول 2012)، ص ص. 1-8، 8ص.
الناشر
Hindawi Publishing Corporation
تاريخ النشر
2012-04-29
دولة النشر
مصر
عدد الصفحات
8
التخصصات الرئيسية
الملخص EN
In EEG and MEG studies on brain functional connectivity and source interactions can be performed at sensor or source level.
Beamformers are well-established source-localization tools for MEG/EEG signals, being employed in source connectivity studies both in time and frequency domain.
However, it has been demonstrated that beamformers suffer from a localization bias due to correlation between source time courses.
This phenomenon has been ascertained by means of theoretical proofs and simulations.
Nonetheless, the impact of correlated sources on localization outputs with real data has been disputed for a long time.
In this paper, by means of a phantom, we address the correlation issue in a realistic MEG environment.
Localization performances in the presence of simultaneously active sources are studied as a function of correlation degree and distance between sources.
A linear constrained minimum variance (LCMV) beamformer is applied to the oscillating signals generated by the current dipoles within the phantom.
Results show that high correlation affects mostly dipoles placed at small distances (1, 5 centimeters).
In this case the sources merge.
If the dipoles lie 3 centimeters apart, the beamformer localization detects attenuated power amplitudes and blurred sources as the correlation level raises.
نمط استشهاد جمعية علماء النفس الأمريكية (APA)
Belardinelli, Paolo& Ortiz, Erick& Braun, Christoph. 2012. Source Activity Correlation Effects on LCMV Beamformers in a Realistic Measurement Environment. Computational and Mathematical Methods in Medicine،Vol. 2012, no. 2012, pp.1-8.
https://search.emarefa.net/detail/BIM-453160
نمط استشهاد الجمعية الأمريكية للغات الحديثة (MLA)
Belardinelli, Paolo…[et al.]. Source Activity Correlation Effects on LCMV Beamformers in a Realistic Measurement Environment. Computational and Mathematical Methods in Medicine No. 2012 (2012), pp.1-8.
https://search.emarefa.net/detail/BIM-453160
نمط استشهاد الجمعية الطبية الأمريكية (AMA)
Belardinelli, Paolo& Ortiz, Erick& Braun, Christoph. Source Activity Correlation Effects on LCMV Beamformers in a Realistic Measurement Environment. Computational and Mathematical Methods in Medicine. 2012. Vol. 2012, no. 2012, pp.1-8.
https://search.emarefa.net/detail/BIM-453160
نوع البيانات
مقالات
لغة النص
الإنجليزية
الملاحظات
Includes bibliographical references
رقم السجل
BIM-453160
قاعدة معامل التأثير والاستشهادات المرجعية العربي "ارسيف Arcif"
أضخم قاعدة بيانات عربية للاستشهادات المرجعية للمجلات العلمية المحكمة الصادرة في العالم العربي
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