Complex fMRI analysis with unrestricted phase is equivalent to a magnitude-only model
Complex fMRI analysis with unrestricted phase is equivalent to a magnitude-only model
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DOI：
10.1016/j.neuroimage.2004.09.038
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发表时间：
2005-01-15
期刊：
影响因子：
5.7
通讯作者：
Logan, BR
中科院分区：
文献类型：
--
作者：
Rowe, DB;Logan, BR
由于相位缺陷，体素时程测量值是复数值。然而，大多数功能磁共振成像研究仅使用幅度时间过程来测量激活。我们表明，仅幅度分析相当于复杂的功能磁共振成像激活模型，其中相位不受限制，或允许随时间动态变化。这表明，通过对每个体素随时间变化的相位进行建模，可以改进仅幅度模型。 (C) 2004 Elsevier Inc. 保留所有权利。
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. (C) 2004 Elsevier Inc. All rights reserved.