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论文类型：期刊论文

发表时间：2015-07-15

发表刊物：JOURNAL OF NEUROSCIENCE METHODS

收录刊物：SCIE、PubMed、Scopus

卷号：249

页面范围：75-91

ISSN号：0165-0270

关键字：Complex-valued fMRI data; Independent component analysis (ICA); Spatial map phase; Phase de-ambiguity; Phase positioning; Phase masking

摘要：Background: ICA of complex-valued fMRI data is challenging because of the ambiguous and noisy nature of the phase. A typical solution is to remove noisy regions from fMRI data prior to ICA. However, it may be more optimal to carry out ICA of full complex-valued fMRI data, since any filtering or voxel-based processing may disrupt information that can be useful to ICA.
   New method: We enable ICA of the full complex-valued fMRI data by utilizing phase information of estimated spatial maps (SMs). The SM phases are first adjusted to properly represent spatial phase changes of all voxels based on estimated time courses (TCs), and then these are used to segment the voxels into BOLD-related and unwanted voxels based on a criterion of TC real-part power maximization. Single-subject and group phase masks are finally constructed to remove the unwanted voxels from the individual and group SM estimates.
   Results: Our method efficiently estimated not only the task-related component but also the non-task-related component DMN.
   Comparison with existing method(s): Our method extracted 139-331% more contiguous and reasonable activations than magnitude-only infomax for the task-related component and DMN at vertical bar Z vertical bar > 2.5, and detected more BOLD-related voxels, but eliminated more unwanted voxels than ICA of complex-valued fMRI data with pre-ICA de-noising. Our TC-based phase de-ambiguity exhibited higher accuracy and robustness than the SM-based method.
   Conclusions: The TC-based phase de-ambiguity is essential to prepare the SM phases. The SM phases provide a new post-ICA index for reliably identifying and suppressing the unwanted voxels. (C) 2015 The Authors. Published by Elsevier B.V.