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Resting State Functional Magnetic Resonance Imaging: Basic Principles And Challenges In Clinical Applications | 12274
OMICS Journal of Radiology
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Resting state functional magnetic resonance imaging (rs-fMRI) has emerged as a novel tool to supplement task-based fMRI in
evaluation of brain function. Spontaneous low frequency fluctuations in regional cerebral blood flow have been demonstrated
with BOLD imaging; these spatially distinct however temporally synchronous fluctuations constitute ?functionally related? brain
areas, whose regions form intrinsic brain networks. Although a universal set of intrinsic networks has not been agreed upon,
several major networks have been investigated in detail such as the default mode network.
Disruptions of brain networks have been demonstrated in various diseases, and several clinical rs-fMRI applications can
be demonstrated. Rs-fMRI may serve as an adjunct tool for clinical or preclinical diagnosis. Rs-fMRI may also allow for better
subsegmentation of heterogenous diseases or to identify patients in whom pharmacological intervention may or may not be
successful based on intrinsic connectivity prior to treatment. Rrs-fMRI may also be used as a potential biomarker for outcome..
An especially important use of rs-fMRI, that of presurgical mapping, is emerging. In this setting, rs-fMRI has several benefits
over task-fMRI, including being potentially applicable in situations where the patient is not able to undergo task-fMRI or when
the accuracy of the results may be questionable due to issues related to effort or task understanding, for example in severely
debilitated patients or in the pediatric population. Due to large intersubject variation, whether rs-fMRI can replace task-fMRI is
to be determined, but at the very least it may serve as a supplementary tool in select situations.
Haris Sair joined the faculty of Johns Hopkins Radiology in 2010. In addition to involvement in clinical fMRI for presurgical mapping, he leads the
resting state fMRI effort at JHU and in addition to numerous research collaborations exploring alterations in brain functional connectivity in topics
such as traumatic brain injury and neurodegeneration, Sair is working to apply resting state fMRI at the single subject level for clinical use.
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