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. 2016 Jul 26;8(7):383–400. doi: 10.4330/wjc.v8.i7.383

Figure 1.

Figure 1

Circle of Willis and Ultrasonographic study by transcranial Doppler ultrasound. A: Circle of Willis; B: Transmission of ultrasound beam through skull using pulsed Doppler sectorial probe with a 2.0-3.5 MHz emission frequency. Probe is positioned on temporal window. MCA: Middle cerebral artery.