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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 PMID: 15627605

Pubmed ID

15627605

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

Authors

Brent R. Logan PhD Director, Professor in the Institute for Health and Equity department at Medical College of Wisconsin
Daniel B. Rowe PhD Adjunct Professor in the Biophysics department at Medical College of Wisconsin

Scopus

2-s2.0-16244374284   30 Citations

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