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. Author manuscript; available in PMC: 2012 Dec 3.
Published in final edited form as: Magn Reson Imaging. 2009 Apr 17;27(8):1019–1029. doi: 10.1016/j.mri.2009.02.004

Figure 3.

Figure 3

The correlation matrix (upper triangular matrix, r-value ranging from −1 to 1) of all noise regressors for noise sources 1) −4) is displayed, showing the collinearity between regressors. In the lower triangular matrix a contour plot highlighting regressors with significant collinearity (p < 0.05) is shown. At this statistical threshold (but not for p < 0.001) some regressors for different noise sources are collinear (see for example low frequency drifts and RVT regressors, or RVT regressors with cardiac-rate regressors).

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