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Fig. 1. —Typical transcranial Doppler with imaging scan and recording from middle cerebral artery (MCA). Waveform is enclosed in envelope, and measurements are made over two cardiac cycles. Image is frozen to allow user to scroll along waveform and identify highest velocity. Doppler image shows circle of Willis. A = anterior cerebral artery, M = middle cerebral artery, P = posterior cerebral artery, RI = resistive index, TAMx = time-averaged mean-maximum.