Numbers of automatic and manual measurements and average imaging transcranial Doppler sonography mean blood flow velocities obtained with automatic and manual tracings in major cerebral arteries of children with sickle cell disease*
| Artery | Automatic (n) | Manual (n) | Velocity ± SD (cm/s) Automatic | Velocity ± SD (cm/s) Manual | Differences (%) | Group Differences (P Value) |
|---|---|---|---|---|---|---|
| MCA Right | 18 | 18 | 129 ± 25 | 128 ± 27 | 1 | .948 |
| MCA Left | 15 | 20 | 131 ± 24 | 138 ± 37 | 5 | .503 |
| ICA Right | 10 | 27 | 125 ± 31 | 107 ± 34 | 14 | .163 |
| ICA Left | 10 | 26 | 123 ± 29 | 122 ± 39 | 1 | .943 |
| ACA Right | 7 | 28 | 83 ± 21 | 108 ± 36 | 23 | .033* |
| ACA Left | 5 | 29 | 104 ± 15 | 123 ± 40 | 15 | .069 |
| PCA Right | 8 | 26 | 110 ± 39 | 103 ± 31 | 6 | .650 |
| PCA Left | 8 | 23 | 89 ± 26 | 102 ± 35 | 13 | .267 |
Note:—ICA indicates internal carotid artery; MCA, middle cerebral artery; ACA, anterior cerebral artery; PCA, posterior cerebral artery; n = number of arteries.
* Significant differences between velocities obtained with automatic and manual tracings.