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Fig. 2B. —53-year-old man with moderate to severe spasm of right middle cerebral artery. Axial color Doppler sonogram shows right middle cerebral artery (red) with sample volume placed on it. To determine angle of insonation, we fitted direction of linear marker to be oriented along axis of artery segment. Velocity waveforms are shown below image. Peak systolic velocity in middle cerebral artery is increased to 264 cm/sec, well above normal reference range.