Transcranial Doppler Device
In 1955, Leksell  found in making echoencephalographic recordings that ultrasound could penetrate the skull. Due to the reflection of ultrasound waves on the skull and on brain structures of various densities and sound conduction velocity, indirect space-occupying lesions could be demonstrated.
KeywordsBlood Flow Velocity Doppler Signal Pulse Repetition Frequency Ultrasound Wave Transmitted Frequency
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