Investigation of Low Frequency Drift in fMRI Signal

• Published in: NeuroImage (Orlando, Fla.) Vol. 9; no. 5; pp. 526 - 533
• Main Authors: Smith, Anne M., Lewis, Bobbi K., Ruttimann, Urs E., Ye, Frank Q., Sinnwell, Teresa M., Yang, Yihong, Duyn, Jeff H., Frank, Joseph A.
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 01.05.1999; Elsevier Limited
• Subjects: Adult; Aged; BOLD; Cadaver; Cadavers; Case-Control Studies; Drift; Functional magnetic resonance imaging; functional magnetic resonance imaging (fMRI); Humans; low frequency drift; Magnetic Resonance Imaging - methods; Male; Middle Aged; Motion; Noise; Normal Distribution; Phantoms, Imaging; Physiology; Pricing policies; Time series; functional magnetic resonance imaging (fMRI); BOLD; low frequency drift; artifacts

Low frequency drift (0.0–0.015 Hz) has often been reported in time series fMRI data. This drift has often been attributed to physiological noise or subject motion, but no studies have been done to test this assumption. Time series T*2-weighted volumes were acquired on two clinical 1.5 T MRI systems...