Transcranial Doppler Ultrasound

What is transcranial doppler ultrasound (TCD)?

Transcranial Doppler ultrasound or TCD is a type of ultrasound that evaluates the blood circulation within the brain.

During the transcranial Doppler ultrasound, sound waves are transmitted through the tissues of the skull. The sound waves allow us to evaluate the speed of the red blood cells moving through the blood vessels within the brain. These are calculated and displayed on a computer screen.

This allows us to determine blood flow to various areas of the brain. The Transcranial Doppler ultrasound allows us to assess for a wide variety of conditions.

Preparation before the examination

There is no specific preparation for the examination. Patient’s will typically carry on with their normal routine prior to the examination.

However, if this examination is done in conjunction with other examinations in the office, there may be other specific preparations that need to be done. This will be explained to you by our staff. Please do not hesitate to call.

What should I expect during the examination?

The examination is noninvasive. Most patients are very comfortable during the transcranial Doppler. You do not have to change into a gown for this exam.

The technologist we’ll set up the machine while you are relaxing on the examination table. If you have difficulty lying down, then the examination will be carried out in a chair.

Ultrasound gel will be applied to the probe. The probe will be placed on various parts of the head and neck including the eyelids, above the cheekbone, in front of the ear, and on the back of the neck.

The ultrasound gel is water-soluble. It can be easily washed off after the examination. The entire examination may take between 30-45 minutes.

There are no side effects to this examination. The test is extremely safe. There is no use of radiation involved.

If you have any questions about your procedure
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