Figure 7
Correlation between BHI
V
and slopes of the hemoglobin signals. Scatter diagram of the BHI
V
and of the 
(left graph) and 
(right graph) values for the 20 subjects. The increment of the CBFV shows a good correlation with the increment of the O2Hb, which can be taken, in this experimental protocol, as an estimate of the increment of the cerebral blood volume.