“…Alternatively, the transcondylar window can be used for the insonation of the ipsilateral vertebral artery. A complete TCD examination usually includes measurement from all four windows but the most common approach in many experiments is through the transtemporal window (e.g., Aaslid, 1986aAaslid, ,b, 1987Bishop et al, 1986;Hennerici et al, 1987;Dewitt and Wechsler, 1988;Bartels et al, 1995;Aaslid et al, 2007). Each approach has unique advantages and challenges, which will be described below (see also (Aaslid, 1986a) and (Ringelstein et al, 1990a) for detailed reviews on examination techniques, basal cerebral artery anatomy and flow dynamics).…”