Advances in low-frequency Doppler ultrasound as well as imaging resolution, color flow and power Doppler have led to the use of these technologies for interrogation of the intracranial circulation through intact skull. It is important for the performance of transcranial Doppler (TCD) and transcranial color duplex sonography (TCCS) to understand proper patient and transducer positioning, anatomic landmarks and appropriate scale settings, including spectral analysis, gray scale and color flow information.
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