We examined the usefulness of the three dimensional transcranial Doppler scanner (Trans-scan: TS), and compared it with the findings of carotid angiography (CAG) . The flow of Ml portion of middle cerebral artery was detectable in 9 cases out of 9 control groups (100%), 26out of 30 cases of cerebral infarction (87%) and 4 out of 4 cases of TIA (100%) .
The blood flow courses and stenosis of the middle cerebral artery observed by TS agreed with those observed by CAG.
The direction of the collateral blood flow was also observed by TS. But blood flow velocity could not be represented in some cases of serious cerebral arteriosclerosis which have tortuous arteries.
This scanner could reproduce the angle at the time of measurement by the image and we found the reproducibility improved.
TS was considered to have greater usefulness than the conventional method by transcranial Doppler.