What is the velocity described for the internal carotid artery when imaged via the transorbital window?

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Multiple Choice

What is the velocity described for the internal carotid artery when imaged via the transorbital window?

Explanation:
In the transorbital window, you’re sampling the intracranial portion of the internal carotid artery, where flow velocities are slower than in the neck. A velocity around 21 cm/s fits the normal range for intracranial ICA flow with this approach, reflecting the smaller caliber and distal location. Higher values (like 39, 47, or 55 cm/s) are more typical of proximal neck segments or other intracranial arteries measured with different windows (for example, the MCA), and would not be expected for the intracranial ICA via the transorbital view. So, 21 cm/s best matches the transorbital intracranial ICA velocity profile.

In the transorbital window, you’re sampling the intracranial portion of the internal carotid artery, where flow velocities are slower than in the neck. A velocity around 21 cm/s fits the normal range for intracranial ICA flow with this approach, reflecting the smaller caliber and distal location. Higher values (like 39, 47, or 55 cm/s) are more typical of proximal neck segments or other intracranial arteries measured with different windows (for example, the MCA), and would not be expected for the intracranial ICA via the transorbital view. So, 21 cm/s best matches the transorbital intracranial ICA velocity profile.

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