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 13 of 13 for “"blood oxygenation level dependent (BOLD)"”.
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Correcting the variations of bold signal due to susceptibility-induced magnetic field gradients and its application
… magnetic resonance imaging (fMRI) using blood oxygenation level dependent (BOLD) signals is a tool that is currently used in many cognitive neuroscience studies. However, many studies do not consider susceptibility-induced magnetic field gradients. Susceptibility-induced magnetic field …
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A multimodal investigation in eye movements
… BNCs. Functional activity is assessed using the blood oxygenation level dependent (BOLD) percent signal change. Task-modulated coactivation is assessed using an ROI-based task modulated coactivation analysis that reveals significant correlation between ROIs.
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Expanding the role of functional mri in rehabilitation research
… magnetic resonance imaging (fMRI) based on blood oxygenation level dependent (BOLD) contrast has become a universal methodology in functional neuroimaging. However, the BOLD signal consists of a mix of physiological parameters and has relatively poor reproducibility. As fMRI becomes a …
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A functional MRI study of the distributed neural circuitry of learning and reward
… magnetic resonance imaging (fMRI) with blood oxygenation level dependent (BOLD) contrast was then used to evaluate the brain activation in response to behaviorally characterized electrical stimuli. High resolution anatomical images revealed that subjects with electrode tips positioned …
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Subject and group level changes and comparison in functional connectivity under low vs. high cognitively demanding naturalistic viewing conditions using fmri
… and implements statistical methods applied on Blood Oxygenation Level Dependent (BOLD) signals. The conventional task based designs are very specific and may not reflect day to day activities. The two task conditions in this study are watching a movie called INSCAPE with low cognitive load and …
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Investigating neural correlates of stimulus repetition using fMRI
… effects in the human brain. However the Blood-Oxygenation Level-Dependent (BOLD) signal measured by fMRI is far removed from the electrical activity recorded from single cells in animal studies of repetition effects. Despite that, there have been many claims about the neural mechanisms …
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Simultaneous DTI and rs-fMRI using the navigated diffusion sequence
Blood oxygenation level dependent (BOLD) functional magnetic resonance imaging (fMRI) and diffusion tensor imaging (DTI) experiments are normally performed separately. The idea of extracting inherently co-registered activation/connectivity maps and diffusion parameters has resulted in efforts to …
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Biophysical modeling of hemodynamic-based neuroimaging techniques
… Magnetic Resonance Imaging (fMRI) based on the Blood Oxygenation Level Dependent (BOLD) response has become the method of choice for exploring brain function, and yet the physiological basis of this technique is still poorly understood. Despite the effort, a detailed and validated model relating …
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Parietal dysfunction in children with prenatal alcohol exposure
… by prenatal alcohol exposure. Functional domains dependent on intact parietal functioning, including mathematical and visuospatial ability, have been consistently implicated in fetal alcohol spectrum disorders. This thesis examines, in children, using blood oxygenation level dependent (BOLD) …
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Bridging Mri Reconstruction Across Eras: From Novel Optimization Of Traditional Methods To Efficient Deep Learning Strategies
… over conventional methods. Furthermore, the blood oxygenation level dependent (BOLD) signal analysis of our proposed method provided meaningful sensitivities, with similar activation patterns and extent to the expected baselines.
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Cardiorespiratory fitness as a modulator of hippocampal subfield structure and function in cognitive aging
… humans. Age-related impairment in hippocampally-dependent cognition emphasizes the importance of identifying modulators of hippocampal plasticity. Critically, studies in older adults have demonstrated that greater cardiorespiratory fitness (CRF) is associated with greater volume of the …
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Strategies for Artifact Correction and Motion Monitoring in MRI Through Innovations in Radiofrequency Coil Design
… loss in gradient-echo EPI, which is used for blood-oxygenation level-dependent (BOLD) functional MRI (fMRI). This was done through modification of the cost function used in the shim optimization, which typically uses a single term representing the B_0 inhomogeneity, to include a second term …
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Validation of statistical methods used in task fMRI studies
… modelling. It considers fMRI used with the blood oxygenation level dependent (BOLD) contrast. Firstly, I compared the most frequently used fMRI analysis packages: AFNI, FSL and SPM, with regard to temporal autocorrelation modelling, often known as pre-whitening. I employed eleven datasets …