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Updated: Jun 19, 2026
Functional Transcranial Doppler Ultrasound for Monitoring Cerebral Blood Flow
Published on: March 15, 2021
Transcranial Doppler series part III: interpretation
Heather A Nicoletto1, Marilyn H Burkman
1Neurodiagnostic Laboratory, Duke University Hospital, Durham, North Carolina, USA.
Insights
Transcranial Doppler (TCD) is a non-invasive method to assess cerebral blood flow. It is valuable for diagnosing conditions like vasospasm and vasculopathy, aiding in critical neurological assessments.
Area of Science:
- Neurology
- Vascular Imaging
Background:
- Transcranial Doppler (TCD) offers a rapid, non-invasive, and cost-effective assessment of basal cerebral artery blood flow.
- Common applications include evaluating vasospasm post-subarachnoid hemorrhage and vasculopathy in pediatric sickle cell anemia.
Purpose of the Study:
- To highlight the diagnostic utility of TCD in various cerebrovascular conditions.
- To outline the key parameters used in TCD interpretation.
Main Methods:
- Utilizes ultrasound waves to measure blood flow velocity and direction in intracranial arteries.
- Non-invasive assessment of cerebral hemodynamics.
Main Results:
- TCD effectively evaluates vasospasm, vasculopathy, intracranial stenosis, and collateral flow.
- It aids in diagnosing arteriovenous malformations, carotid fistulas, and confirming cerebral circulatory arrest.
Conclusions:
- TCD is a versatile tool for diagnosing a range of cerebrovascular diseases.
- Key parameters like systolic upstroke, velocity, pulsatility index, and flow direction are crucial for accurate TCD interpretation.
Abstract:
Transcranial Doppler (TCD) is a quick, non-invasive, and inexpensive way to evaluate the blood flow in the basal cerebral arteries. TCD is most commonly used to evaluate for vasospasm in patients with subarachnoid hemorrhage and for vasculopathy in children with sickle cell anemia. It may also be used to evaluate intracranial vessel narrowing and occlusion; collateral flow due to extracranial vessel occlusion, arteriovenous malformations, and cavernous carotid fistulas; and to help confirm cerebral circulatory arrest. Systolic upstroke, velocity, pulsatility index, and direction of flow aid in the interpretation of TCD.
