A wavelet-based statistical analysis of fMRI data
A wavelet-based statistical analysis of fMRI data
复制标题
基于小波的功能磁共振成像数据统计分析
作者:
I. Dinov;John W. Boscardin;M. Mega;Elizabeth L. Sowell;A. Toga
We propose a new method for statistical analysis of functional magnetic resonance imaging (fMRI) data. The discrete wavelet transformation is employed as a tool for efficient and robust signal representation. We use structural magnetic resonance imaging (MRI) and fMRI to empirically estimate the distribution of the wavelet coefficients of the data both across individuals and spatial locations. An anatomical subvolume probabilistic atlas is used to tessellate the structural and functional signals into smaller regions each of which is processed separately. A frequency-adaptive wavelet shrinkage scheme is employed to obtain essentially optimal estimations of the signals in the wavelet space. The empirical distributions of the signals on all the regions are computed in a compressed wavelet space. These are modeled by heavy-tail distributions because their histograms exhibit slower tail decay than the Gaussian. We discovered that the Cauchy, Bessel K Forms, and Pareto distributions provide the most accurate asymptotic models for the distribution of the wavelet coefficients of the data. Finally, we propose a new model for statistical analysis of functional MRI data using this atlas-based wavelet space representation. In the second part of our investigation, we will apply this technique to analyze a large fMRI dataset involving repeated presentation of sensory-motor response stimuli in young, elderly, and demented subjects.
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DOI:
10.1176/jnp.12.2.209
发表时间:
2000
期刊:
The Journal of neuropsychiatry and clinical neurosciences
影响因子:
--
作者:
Mega,MS;Dinov,ID;Lee,L;O'Connor,SM;Masterman,DM;Wilen,B;Mishkin,F;Toga,AW;Cummings,JL
通讯作者:
Cummings,JL
DOI:
--
发表时间:
2001
期刊:
Neuropsychiatry, neuropsychology, and behavioral neurology.
影响因子:
--
作者:
Mega,MS;Cummings,JL;O'Connor,SM;Dinov,ID;Reback,E;Felix,J;Masterman,DL;Phelps,ME;Small,GW;Toga,AW
通讯作者:
Toga,AW
影响因子:
10.6
作者:
U. Kjems;S. Strother;J. Anderson;I. Law;L. K. Hansen
通讯作者:
U. Kjems;S. Strother;J. Anderson;I. Law;L. K. Hansen
影响因子:
14.5
作者:
JERNIGAN, TL;TRAUNER, DA;TALLAL, PA
通讯作者:
TALLAL, PA
DOI:
--
发表时间:
1995
期刊:
Proceedings. Symposium on Computer Applications in Medical Care
影响因子:
--
作者:
Bradley,SW;Rosse,C;Brinkley,JF
通讯作者:
Brinkley,JF