Reference work entry
TCD; Transcranial Doppler ultrasound
A technique used to evaluate the hemodynamic activity of intracranial vessels using Doppler ultrasound technology.
Doppler ultrasound uses the concept of sonar technology; it evaluates the ability of structures to transmit or impede sonic waves. Specifically with transcranial Doppler (TCD), a low-frequency transducer is placed on the scalp and projects a sonic wave into the skull that is then reflected back to the transducer, which also acts as the receiver. TCD is commonly used to record blood flow velocities in the anterior, middle, and posterior cerebral arteries. It has several advantages compared to other neuroimaging techniques. It is noninvasive, uses no ionizing radiation, is inexpensive, and is portable. TCD is applied in neurocritical care settings in multiple capacities, including assessment of vasospastic reactions, cerebral hemodynamic changes, and intracranial pressure for a range of clinical...
References and Readings
- Grossman, R., & Yousem, D. (2003). Neuroradiology: The requisites (2nd ed.). Philadelphia: Mosby.Google Scholar
- Ricker, J. (2005). Functional neuroimaging in medical rehabilitation populations, Chapter 9. In J. DeLisa, B. Gans, & N. Walsh (Eds.), Physical medicine and rehabilitation (4th ed.). Philadelphia: Lippincott Williams & Wilkins.Google Scholar
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