Applying Independent Component Analysis to Clinical FMRI at 7 t

Overview

Journal Front Hum Neurosci

Specialty Neurology

Date 2013 Sep 14

PMID 24032007

Citations 13

Authors

Simon Daniel Robinson

Veronika Schopf

Pedro Cardoso

Alexander Geissler

Florian Ph S Fischmeister

Moritz Wurnig

Siegfried Trattnig

Roland Beisteiner

Affiliations

Soon will be listed here.

Abstract

Increased BOLD sensitivity at 7 T offers the possibility to increase the reliability of fMRI, but ultra-high field is also associated with an increase in artifacts related to head motion, Nyquist ghosting, and parallel imaging reconstruction errors. In this study, the ability of independent component analysis (ICA) to separate activation from these artifacts was assessed in a 7 T study of neurological patients performing chin and hand motor tasks. ICA was able to isolate primary motor activation with negligible contamination by motion effects. The results of General Linear Model (GLM) analysis of these data were, in contrast, heavily contaminated by motion. Secondary motor areas, basal ganglia, and thalamus involvement were apparent in ICA results, but there was low capability to isolate activation in the same brain regions in the GLM analysis, indicating that ICA was more sensitive as well as more specific. A method was developed to simplify the assessment of the large number of independent components. Task-related activation components could be automatically identified via these intuitive and effective features. These findings demonstrate that ICA is a practical and sensitive analysis approach in high field fMRI studies, particularly where motion is evoked. Promising applications of ICA in clinical fMRI include presurgical planning and the study of pathologies affecting subcortical brain areas.

Citing Articles

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