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. 2008 Nov 12;8:50. doi: 10.1186/1471-2393-8-50

Figure 1.

Figure 1

(A) Individual measurements and calculated reference ranges for the resistive index (RI) in the MCA. The standard boundaries include 90% of the normal patient population (Cubic R square = 0.386, P = 0.000). (B) Individual measurements and calculated reference ranges for the pulsatility index (PI) in the MCA. The standard boundaries include 90% of the normal patient population (Cubic R square = 0.340, P = 0.000). (C) Individual measurements and calculated reference ranges for the systolic to diastolic ratio (S/D ratio) in the MCA. The standard boundaries include 90% of the normal patient population (Cubic R square = 0.334, P = 0.000). (D) Individual measurements and calculated reference ranges for the peak systolic velocity (PSV) in the MCA. The standard boundaries include 90% of the normal patient population (Cubic R square = 0.535, P = 0.000).