Search for dissertations about: "BOLD"

Showing result 1 - 5 of 31 swedish dissertations containing the word BOLD.

  1. 1. Functional brain imaging of cognitive status in Parkinson's disease

    University dissertation from Umeå : Umeå Universitet

    Author : Urban Ekman; Umeå universitet.; [2014]
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Parkinson’s disease; functional MRI; Mild cognitive impairment; Working memory; Parkinson’s disease dementia; BOLD;

    Abstract : Parkinson’s disease (PD) is next to Alzheimer’s disease (AD) the second most common neurodegenerative disease. PD has traditionally been characterised as a motor disorder, but more recent research has revealed that cognitive impairments are frequent. READ MORE

  2. 2. Machine learning for identification of brain activity patterns with applications in gentle touch processing

    University dissertation from Umeå : Umeå Universitet

    Author : Malin Björnsdotter Åberg; Göteborgs universitet.; Gothenburg University.; [2009]
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Somatosensory; Machine learning; Pattern recognition; fMRI; Support vector machines; Neuroscience; Brain; BOLD; Signal processing; Artificial intelligence; Touch; Human; Unmyelinated; Sensory; Affective;

    Abstract : Since the first mention of artificial intelligence in the 1950s, the field of machine learning has provided increasingly appealing tools for recognition of otherwise unintelligible pattern representations in complex data structures. Human brain activity, acquired using functional magnetic resonance imaging (fMRI), is a prime example of such complex data where the utility of pattern recognition has been demonstrated in a wide range of studies recently (Haynes et al. READ MORE

  3. 3. Characterization of the BOLD signal in functional MRI

    University dissertation from Stockholm : Karolinska Institutet, Dept of Clinical Science, Intervention and Technology

    Author : Tomas Jonsson; Karolinska Institutet.; Karolinska Institutet.; [2012]
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES;

    Abstract : In the last two decades, functional magnetic resonance imaging (fMRI) has become an important and widely used imaging technique for functional brain mapping. However, blood oxygen level dependent (BOLD) technique is quite insensitive and task invoked BOLD signal change at 3T is typically in the order of a few percent. READ MORE

  4. 4. Mechanistic modelling - a BOLD response to the fMRI information loss problem

    University dissertation from Linköping : Linköping University Electronic Press

    Author : Karin Lundengård; Linköpings universitet.; Linköpings universitet.; Linköpings universitet.; [2017]
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES;

    Abstract : Functional Magnetic Resonance Imaging (fMRI) is a common technique for imaging brain activity in humans. However, the fMRI signal stems from local changes in oxygen level rather than from neuronal excitation. READ MORE

  5. 5. Analysis and development of strategies for magnetic resonance functional neuroimaging

    University dissertation from Stockholm : Karolinska Institutet, Department of Clinical Neuroscience

    Author : Peter Fransson; Karolinska Institutet.; Karolinska Institutet.; [1999]
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; neuroimaging; human brain; functional activation; magnetic resonance imaging; cerebral blood oxygenation;

    Abstract : This thesis focuses on strategies for oxygenation-sensitive MRI that are designed to measure alterations in brain physiology induced by changes in neuronal activity. In a first study, it was shown that the temporal evolution of BOLD MRI signal changes in response to both brief and sustained visual activation are equally well visible in FLASH and EPI recordings. READ MORE