In the prospective study of 36 patients following severe head injury a close relationship was found between cerebral blood flow velocity measured by transcranial Doppler ultrasonography and cerebral blood flow measured by xenon enhanced computed tomography. The relationship was present only at the earliest time after injury and was dissolved within 24 hours. The presented study documents a possible application of transcranial Doppler ultrasonography in detection of posttraumatic hypoperfusion early after brain injury.

        Key words: cerebral blood flow – cerebral blood flow velocity – transcranial Doppler ultrasonography – xenon enhanced computed tomography