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Expected TCD Insonation Depth for Adults and Flow Direction
| Artery | Depth (mm) | Direction of Flow |
|---|---|---|
| MCA | 40–65 | Towards |
| ACA | 60–75 | Away |
| PCA | 55–75 | Bidirectional |
| BA | 80–105 | Away |
Adapted from Alexandrov et al., 2006
MCA: middle cerebral artery; ACA: anterior cerebral artery; PCA: posterior cerebral artery; BA: basilar artery
