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. 2014 Sep 2;1(2):025001. doi: 10.1117/1.NPh.1.2.025001

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© 2014 Society of Photo-Optical Instrumentation Engineers (SPIE)

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Fig. 3 — Method for calculation of nodal point spread function (PSF) correlation. (a) Selection of brain mesh node. (b) Near-infrared spectroscopy (NIRS) PSF for selected node. (c) Electroencephalography (EEG) PSF for selected node. (d) Correlation of $R = 0.7$ between EEG ( $x$ -axis) and NIRS ( $y$ -axis) PSFs at selected node (normalized units).