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“School of Cognitive Sciences”

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Paper   IPM / Cognitive Sciences / 7861
School of Cognitive Sciences
  Title:   Activation Detection in Multi-Subject Studies of fMRI Using GLRT
1.  S.M. Shams
2.  G.A. Hossein-Zadeh
3.  H. Soltanian-Zadeh
  Status:   In Proceedings
  Proceeding: IEEE - 2004 Nuclear Science Symposium and Medical Imaging conference
  Year:  2004
  Supported by:  IPM
A new method based on generalized likelihood ratio test (GLRT) for activation detection in multi-subject studies of functional MRI (fMRI) is proposed. In this method, we test the correlation between the fMRI time series of different subjects and the bases of a signal subspace which increases the flexibility of method in detecting different shapes of hemodynamic response. The proposed multivariate method can be applied to group studies where the conventional cross-correlation method cannot be used due to its univariate property. This method is applied to both experimental and simulated fMRI data and the results are compared to those of general linear model (GLM). We show that the proposed method detects more significant activated regions in analyzing experimental data and more true voxels in simulated data.

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