Xiaomu Song1, Lawrence P Panych2, Nan-kuei Chen3. 1. Department of Electrical Engineering, School of Engineering, Widener University, Kirkbride Hall, Room 369, One University Place, Chester, PA 19013, United States. Electronic address: xmsong@widener.edu. 2. Department of Radiology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, United States. 3. Brain Imaging and Analysis Center, Duke University Medical Center, Box 3918, Hock Plaza, Durham, NC 27710, United States.
Abstract
BACKGROUND: Reliable mapping of brain function across sessions and/or subjects in task- and resting-state has been a critical challenge for quantitative fMRI studies although it has been intensively addressed in the past decades. NEW METHOD: A spatially regularized support vector machine (SVM) technique was developed for the reliable brain mapping in task- and resting-state. Unlike most existing SVM-based brain mapping techniques, which implement supervised classifications of specific brain functional states or disorders, the proposed method performs a semi-supervised classification for the general brain function mapping where spatial correlation of fMRI is integrated into the SVM learning. The method can adapt to intra- and inter-subject variations induced by fMRI nonstationarity, and identify a true boundary between active and inactive voxels, or between functionally connected and unconnected voxels in a feature space. RESULTS: The method was evaluated using synthetic and experimental data at the individual and group level. Multiple features were evaluated in terms of their contributions to the spatially regularized SVM learning. Reliable mapping results in both task- and resting-state were obtained from individual subjects and at the group level. COMPARISON WITH EXISTING METHODS: A comparison study was performed with independent component analysis, general linear model, and correlation analysis methods. Experimental results indicate that the proposed method can provide a better or comparable mapping performance at the individual and group level. CONCLUSIONS: The proposed method can provide accurate and reliable mapping of brain function in task- and resting-state, and is applicable to a variety of quantitative fMRI studies.
BACKGROUND: Reliable mapping of brain function across sessions and/or subjects in task- and resting-state has been a critical challenge for quantitative fMRI studies although it has been intensively addressed in the past decades. NEW METHOD: A spatially regularized support vector machine (SVM) technique was developed for the reliable brain mapping in task- and resting-state. Unlike most existing SVM-based brain mapping techniques, which implement supervised classifications of specific brain functional states or disorders, the proposed method performs a semi-supervised classification for the general brain function mapping where spatial correlation of fMRI is integrated into the SVM learning. The method can adapt to intra- and inter-subject variations induced by fMRI nonstationarity, and identify a true boundary between active and inactive voxels, or between functionally connected and unconnected voxels in a feature space. RESULTS: The method was evaluated using synthetic and experimental data at the individual and group level. Multiple features were evaluated in terms of their contributions to the spatially regularized SVM learning. Reliable mapping results in both task- and resting-state were obtained from individual subjects and at the group level. COMPARISON WITH EXISTING METHODS: A comparison study was performed with independent component analysis, general linear model, and correlation analysis methods. Experimental results indicate that the proposed method can provide a better or comparable mapping performance at the individual and group level. CONCLUSIONS: The proposed method can provide accurate and reliable mapping of brain function in task- and resting-state, and is applicable to a variety of quantitative fMRI studies.
Authors: Seung-Schik Yoo; Xingchang Wei; Chandlee C Dickey; Charles R G Guttmann; Lawrence P Panych Journal: Int J Neurosci Date: 2005-01 Impact factor: 2.292
Authors: Mark W Woolrich; Saad Jbabdi; Brian Patenaude; Michael Chappell; Salima Makni; Timothy Behrens; Christian Beckmann; Mark Jenkinson; Stephen M Smith Journal: Neuroimage Date: 2008-11-13 Impact factor: 6.556
Authors: Angela R Laird; P Mickle Fox; Simon B Eickhoff; Jessica A Turner; Kimberly L Ray; D Reese McKay; David C Glahn; Christian F Beckmann; Stephen M Smith; Peter T Fox Journal: J Cogn Neurosci Date: 2011-06-14 Impact factor: 3.225
Authors: Michael J Miller; Craig Weiss; Xiaomu Song; Gheorghe Iordanescu; John F Disterhoft; Alice M Wyrwicz Journal: J Neurosci Date: 2008-05-07 Impact factor: 6.167
Authors: Matthew C Murphy; Alexander J Poplawsky; Alberto L Vazquez; Kevin C Chan; Seong-Gi Kim; Mitsuhiro Fukuda Journal: Neuroimage Date: 2016-05-25 Impact factor: 6.556