Transcranial Doppler uses a handheld-pulsed low frequency Doppler transducer that enables recording of blood flow velocities from intracranial arteries through selected cranial foramina and thin regions of the skull. Analysis of the Doppler spectra allows display and calculation of peak systolic, peak diastolic, and mean velocities and pulsatility indices. Mapping of the sampled velocities as a color display of spectra in lateral, coronal and horizontal views locates the major brain arteries in three dimensions.
Transcranial Doppler (TCD) Advantages
- Non-invasive method enabling physicians to define moment-to-moment changes in cerebral blood flow velocities.
- Bedside assessment of cerebrovascular circulation hemodynamics.
- Continuous monitoring for emboli detection.
- Intra-operative and post-operative monitoring for identifying hypoperfusion, preoperative thrombosis, heperperfusion syndrome and ongoing intra-arterial embolism.
- Absolutely safe. Contrast agents are not used, thereby avoiding allergic reactions and decreasing risk to the patient.