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  Spatio-temporal covariance model for medical images sequences: Application to functional MRI data

Benali, H., Pelegrini-Issac, M., & Kruggel, F. J. (2001). Spatio-temporal covariance model for medical images sequences: Application to functional MRI data. In M. F. Insana (Ed.), Information Processing in Medical Imaging (pp. 197-203). Berlin: Springer. doi:10.1007/3-540-45729-1_20.

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Genre: Conference Paper

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 Creators:
Benali, Habib1, Author
Pelegrini-Issac, Melanie1, Author
Kruggel, Frithjof J.2, Author           
Affiliations:
1External Organizations, ou_persistent22              
2MPI of Cognitive Neuroscience (Leipzig, -2003), The Prior Institutes, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634574              

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Free keywords: Temporal Correlation; fMRI Data; Multivariate Regression Model; Variogram Model; Hemodynamic Signal
 Abstract: Spatial and temporal correlations which affect the signal measured in functional MRI (fMRI) are usually not considered simultaneously (i.e., as non-independent random processes) in statistical methods dedicated to detecting cerebral activation.We propose a new method for modeling the covariance of a stationary spatio-temporal random process and apply this approach to fMRI data analysis. For doing so, we introduce a multivariate regression model which takes simultaneously the spatial and temporal correlations into account. We show that an experimental variogram of the regression error process can be fitted to a valid nonseparable spatio-temporal covariance model. This yields a more robust estimation of the intrinsic spatio-temporal covariance of the error process and allows a better modeling of the properties of the random fluctuations affecting the hemodynamic signal. The practical relevance of our model is illustrated using real event-related fMRI experiments.

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Language(s): eng - English
 Dates: 2001-06-082001
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1007/3-540-45729-1_20
 Degree: -

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Title: 17th International Conference, IPMI 2001
Place of Event: Davis, CA
Start-/End Date: 2001-06-18 - 2001-06-22

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Title: Information Processing in Medical Imaging
Source Genre: Proceedings
 Creator(s):
Insana, Michael F.1, Editor
Leahy, Richard M. 1, Author
Affiliations:
1 External Organizations, ou_persistent22            
Publ. Info: Berlin : Springer
Pages: XVI, 537 S. Volume / Issue: - Sequence Number: - Start / End Page: 197 - 203 Identifier: ISBN: 978-3-540-45729-9
DOI: 10.1007/3-540-45729-1