Fig. 2

Transcranial Doppler for vasospasm following subarachnoid hemorrhage. a CT Head demonstrating diffuse subarachnoid hemorrhage. b TCD measurement of left MCA flows, demonstrating a mean MCA velocity of 123 cm/s (in-keeping with mild vasospasm). c Measurement of ipsilateral left ICA flows for calculation of Lindegaard ratio of 3.8 (Mean MCA/ICA velocity = 123/32.5 cm/s), which confirmed mild MCA vasospasm