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Table 3 Quantitative 2D flow results

From: Doppler ultrasound cardiac gating of intracranial flow at 7T

  2D flow M1Ra 2D flow CAb
ECG   DUS ECG   DUS
Net flow volume       
 (M1:ml, CA:μl) 1.6 ± 0.41   1.5 ± 0.39 − 3.0 ± 5.8   − 3.6 ± 2.1
 Bias ± 1.96SD   − 0.021 ± 0.36    0.61 ± 13.6  
Mean flow       
 (M1:ml/s, CA: μl /s) 1.7 ± 0.45   1.7 ± 0.41 − 3.0 ± 6.1   − 3.9 ± 2.4
 Bias ± 1.96SD   − 0.010 ± 0.37    0.90 ± 15  
Mean velocity (cm/s) 27 ± 3.4   29 ± 4.3 − 0.078 ± 0.18   − 0.16 ± 0.13
 Bias ± 1.96SD   1.3 ± 3.9    0.78 ± 5.4  
Peak velocity (cm/s) 90 ± 31   101 ± 30 − 9.7 ± 1.9   − 8.8 ± 2.9
 Bias ± 1.96SD   − 1.57 ± 108    − 0.91 ± 4.7  
  1. aRight M1 branch of the middle cerebral artery (MCA). Direction of positive flow is towards the right side of the patient, away from the Circle of Willis
  2. bCerebral aqueduct. Direction of positive flow is towards the ventricles