![]() This real time imaging technique provides a two-dimensional gray-scale image of the soft tissues and vessels based on the acoustic properties of the tissues.ĭuplex ultrasonography combines the direct visualization capabilities of B-mode ultrasonography and the blood- flow velocity measurements of doppler ultrasonography. The second key component of vascular diagnostic ultrasound is the B-mode, or brightness-mode image. The doppler ultrasound involves the evaluation of the supraorbital, common carotid, external carotid, internal carotid, and the vertebral arteries in the extracranial cerebrovascular assessment.
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