Complex fMRI analysis with unrestricted phase is equivalent to a magnitude-only model. Neuroimage 2005 Jan 15;24(2):603-6
Date
01/04/2005Pubmed ID
15627605DOI
10.1016/j.neuroimage.2004.09.038Scopus ID
2-s2.0-16244374284 (requires institutional sign-in at Scopus site) 31 CitationsAbstract
Due to phase imperfections, voxel time course measurements are complex valued. However, most fMRI studies measure activation using magnitude-only time courses. We show that magnitude-only analyses are equivalent to a complex fMRI activation model in which the phase is unrestricted, or allowed to dynamically change over time. This suggests that improvements to the magnitude-only model are possible by modeling the phase in each voxel over time.
Author List
Rowe DB, Logan BRAuthor
Brent R. Logan PhD Director, Professor in the Institute for Health and Equity department at Medical College of WisconsinMESH terms used to index this publication - Major topics in bold
AnimalsImage Processing, Computer-Assisted
Likelihood Functions
Magnetic Resonance Imaging
Models, Neurological
Reproducibility of Results