Skip to main content
. Author manuscript; available in PMC: 2012 Sep 1.
Published in final edited form as: Neuroimage. 2011 Jun 6;58(1):198–212. doi: 10.1016/j.neuroimage.2011.05.077

Figure 4. Percent error (ζ ) in δCMRO2 calculations using the classic and optimized Davis model parameter sets.

Figure 4

(a) Using the classic Davis model, δCMRO2 is consistently underestimated as indicated by the turquoise areas along the n=2.5 and n=5 coupling parameter lines. (b) The optimized parameters of α=0.14 and β=0.91 produce much more accurate estimates of δCMRO2 across the entire expanse examined. This is apparent from the green coloring across the majority of the δCBF-δCMRO2 plane corresponding to zero error. Errors around δCMRO2=0 are artifacts of division by a small number.