Correcting the variations of bold signal due to susceptibility-induced magnetic field gradients and its application
Ho, David
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https://hdl.handle.net/2142/30917
Description
Title
Correcting the variations of bold signal due to susceptibility-induced magnetic field gradients and its application
Author(s)
Ho, David
Issue Date
2012-05-22T00:15:01Z
Director of Research (if dissertation) or Advisor (if thesis)
Sutton, Bradley P.
Department of Study
Electrical & Computer Eng
Discipline
Electrical & Computer Engr
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
Functional magnetic resonance imaging or functional MRI (fMRI)
blood oxygenation level dependent (BOLD) signal
susceptibility
blood oxygenation level dependent (BOLD)
Abstract
Functional 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 gradients can vary echo time, which can also vary BOLD sensitivity. In order to correct artifacts, we introduce percent signal change and calibration function. We show calibration can reduce the artifacts and can be applied in many studies such as age-related studies.
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