Medical College of Wisconsin
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Complex fMRI analysis with unrestricted phase is equivalent to a magnitude-only model. Neuroimage 2005 Jan 15;24(2):603-6

Date

01/04/2005

Pubmed ID

15627605

DOI

10.1016/j.neuroimage.2004.09.038

Scopus ID

2-s2.0-16244374284 (requires institutional sign-in at Scopus site)   33 Citations

Abstract

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 BR

Author

Brent R. Logan PhD Director, Professor in the Data Science Institute department at Medical College of Wisconsin




MESH terms used to index this publication - Major topics in bold

Animals
Image Processing, Computer-Assisted
Likelihood Functions
Magnetic Resonance Imaging
Models, Neurological
Reproducibility of Results