Figure 4From: Relationship between oxygen supply and cerebral blood flow assessed by transcranial Doppler and near – infrared spectroscopy in healthy subjects during breath – holdingEvaluation of the slope of the chromophore concentration changes. Sketch of the slope computation for the O2Hb concentration signal of a healthy subject during BH: from the minimum and the maximum point of the concentration during BH, the angular coefficient of the linear regression line is computed. This slope is taken as index of VMR.Back to article page