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. Author manuscript; available in PMC: 2018 Feb 2.
Published in final edited form as: Magn Reson Med. 2016 Feb 7;76(6):1697–1707. doi: 10.1002/mrm.26038

Figure 7. NIRS LFOs contain information highly correlated with BOLD fMRI.

Figure 7

(a) BOLD fMRI variance explained by the LFO methods in the grey matter as boxplots from left to right: NIRS Δ[HbO], Δ[Hb] and Δ[tHB] LFOs, the cardiac variation method HRCRF, and the two respiration variation methods RVRRF and RVT. The median is indicated with a horizontal line in the boxplots, and the outlier by a ‘+’. (b) Difference in explained BOLD fMRI variance between NIRS Δ[HbO] and Δ[Hb] (HBO+HB) combined and the respiration and cardiac variation models combined (HRCRF+RVRRF and HRCRF+RVT) per participant. The respiration and cardiac based models combined explained variance (%) was subtracted from the NIRS LFOs. Positive values indicate that the NIRS LFOs performed better and negative values indicate that respiration and cardiac based models performed better.