Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 10 of 10 for “"physiological noise"”.
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Test-retest Reliability of Intrinsic Human Brain Default-Mode fMRI Connectivity: Slice Acquisition and Physiological Noise Correction Effects
… in two separate studies, strategies for physiological noise and head motion correction in resting state brain FC-fMRI. In particular, as a general marker of noise correction performance we use the test-retest reproducibility of the DMN. The guiding hypothesis is that methods that improve …
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Dynamical mechanisms of neural firing irregularity and modulation sensitivity with applications to cochlear implants
… at high stimulation rates has been attributed to noise caused by the random open and closing of voltage-gated ion channels. This explanation however is incomplete: an additional mechanism must be operating to account for the different effects of noise at the two stimulation rates. We have …
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Methods for functional brain imaging
… the ability to discriminate against detrimental physiological noise. To accomplish this it exploits highly accelerated parallel imaging techniques and MRI signal detection with a large number of coil elements. We then address a major problem in the application of fMVIRI to auditory studies. In …
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Improved Methods for Motion-Compensating and Event-Related Spinal Functional Magnetic Resonance Imaging (fMRI)
… herein have investigated potential sources of noise that might limit its sensitivity and reliability. For example, multiple studies had previously suggested that the majority of structured physiological noise, such as spinal cord motion and cerebrospinal fluid (CSF) flow, appeared to be …
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Design and statistical analysis of fMRI experiments to assess human brain hemodynamic responses
… be compared to traditional behavioral and electrophysiological experiments. Eventrelated (brief ,timulus presentation) techniques of electrophysiological experiments have recently been applied to fMRI, although most efforts have been far from optimal. The overall goal of this work was to develop …
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MRI based cerebral oxygenation measures in humans : technical development for use across lifespan
… by eightfold while improving robustness to physiological noise and motion. We also corrected the effect of residual cerebrospinal fluid signal on transverse relaxation time quantification. The detected change in oxygen extraction fraction in the visual cortex during visual stimulation, …
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FUNCTIONAL NETWORK CONNECTIVITY IN HUMAN BRAIN AND ITS APPLICATIONS IN AUTOMATIC DIAGNOSIS OF BRAIN DISORDERS
… believed to originate from physical and physiological noise, can be used to discriminate schizophrenia patients with high accuracy.
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Analysis of very low frequency oscillations in electromagnetic brain signal recordings
… oscillations (<0.5 Hz), previously regarded as physiological noise, have of late been increasingly analysed in neuroimaging studies. These slow oscillations, which occur within widely distributed neuroanatomical systems and are unrelated to cardiac and respiratory events, are thought to arise …
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fMRI for mapping the plastic somatotopy of primary somatosensory cortex - Development and clinical applications
… based on acquiring brain images sensitive to the physiological response following neural activation, and hence, allows brain activity to be examined and documented. In this thesis, methods for fMRI mapping of the primary somatosensory cortex (S1) are optimised and subsequently applied in studies …
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Self-navigated prospective motion correction of repeated 3D-EPI acquisitions for functional MRI applications
… pulsating motions, which are likely due to physiological noise, limit the accuracy of motion estimation. The detection of continuously pulsating motions was unexpected. These data could potentially be included in motion models to better account for physiological processes. In conclusion, our …