Shigeyoshi Teramoto

A simplified method for crosscorrelation analysis

Abstract A simple method of obtaining a crosscorrelogram between two waveforms has been described. Comparison between the formal method of crosscorelation and the simplified procedure demonstrates a good similarity of the results obtained.

A simplified method for autocorrelation analysis in electroencephalography.

Abstract a simple method of obtaining an auto-correlogram of the wave form has been described. Comparison between the orthodox method of auto-correlation and the simplified procedure demonstrates a good similarity of the results, provided that the wave form under analysis is of adequate lenght.

A simplified method for determining the average response time-pattern of the evoked potential in electroencephalography

Abstract A method has been described to obtain the average response time-pattern of evoked potentials in the electroencephalogram. This method is particularly useful for short recording periods. Comparison has been made to Dawsons summation technique of demonstrating evoked responses; improvement and clarity of the calculated responses is shown.

Moyamoya Vessels associated with Multiple Cerebral Aneurysms

A case of multiple cerebral aneurysms associated with so-called moyamoya disease is reported. The patient was a 52-year-old male attacked by subarachnoid hemorrhage. The patient was confused and signs of meningeal irritation were noted. Computed tomography (CT) scan showed the ventricular hemorrhage. Right carotid angiogram showed moyamoya vessels in the basal ganglia. The other angiograms showed three aneurysms, which were located at the origin of the posterior communicating artery (ICA-PCA) on the left, at the posterior cerebral-posterior communicating artery origin (PCA-PcomA) on the right, and the distal site of the posterior choroidal artery (PchA) on the left. Two aneurysms located at the origin of PCA and ICA were clipped by the transsylvian approach, the former being reached through the moyamoya vessels. Spontaneous regression of an aneurysm at the peripheral portion of PchA were angiographically documented 10 days after the second operation. There were no changes around the basal ganglia on post-operative CT. Histological examination of a part of the flat and small middle cerebral artery (M1) gained during operation revealed proliferation of intima, elongated elastica interna and loss of media. Forty-four reported cases of so-called moyamoya disease with aneurysm were discussed. As for operative indication of the aneurysm associated with moyamoya vessels, the authors consider that the aneurysm classified after Okamoto, et al. as Type III or major artery aneurysm, was almost saccular and the operative approach does not always injure moyamoya vessels.