Two methods of recording may be used for this procedure. ![]() The tests are also used for research in cognitive neuroscience (see Functional transcranial Doppler, below). The tests are often used in conjunction with other tests such as MRI, MRA, carotid duplex ultrasound and CT scans. The equipment used for these tests is becoming increasingly portable, making it possible for a clinician to travel to a hospital, to a doctor's office, or to a nursing home for both inpatient and outpatient studies. ![]() The tests are possibly useful for perioperative monitoring and meningeal infection. The tests are effective for detecting sickle cell disease, ischemic cerebrovascular disease, subarachnoid hemorrhage, arteriovenous malformations, and cerebral circulatory arrest. These relatively quick and inexpensive tests are growing in popularity. They are used as tests to help diagnose emboli, stenosis, vasospasm from a subarachnoid hemorrhage (bleeding from a ruptured aneurysm), and other problems. ![]() These modes of medical imaging conduct a spectral analysis of the acoustic signals they receive and can therefore be classified as methods of active acoustocerebrography. Transcranial Doppler ( TCD) and transcranial color Doppler ( TCCD) are types of Doppler ultrasonography that measure the velocity of blood flow through the brain's blood vessels by measuring the echoes of ultrasound waves moving transcranially (through the cranium). Transcranial doppler ultrasound analyzer of blood velocity
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