For the TCD measure and registration, a pulsed Doppler transducer gated at a focal depth of 45-60 mm was placed over the temporal bone to insonate
the main stem of the ipsilateral MCA; the TCD transducer was fixed with a head frame, and the peak systolic MCAV was recorded continuously.
Trans-vaginal probe insonate
at higher frequency i.
We can subject this vessel to ultrasound waves, or insonate
, through the skull and monitor its patency [absence of blockage].
Although it is used infrequently, the submandibular approach may be used to insonate
the retromandibular and extradural segments of the ICA (Fig 6), if a patient's condition warrants or permits it.
For LACS, we were not able to insonate
deeply enough and therefore relied on MRI and CT findings from the pre-INTRACAROTID-SODIUM-NITROPRUSSIDE phase.