Correcting the variations of bold signal due to susceptibility-induced magnetic field gradients and its application

Functional magnetic resonance imaging or functional MRI (fMRI);blood oxygenation level dependent (BOLD) signal;susceptibility;blood oxygenation level dependent (BOLD)

Ho, David ; Sutton ; Bradley P.

关键词: Functional magnetic resonance imaging or functional MRI (fMRI);    blood oxygenation level dependent (BOLD) signal;    susceptibility;    blood oxygenation level dependent (BOLD);   

Others  :  https://www.ideals.illinois.edu/bitstream/handle/2142/30917/HO_DAVID.pdf?sequence=1&isAllowed=y

美国|英语

来源: The Illinois Digital Environment for Access to Learning and Scholarship

【 摘 要 】

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.