Reappraisal of the value of mode-A-echoencephalography

The result of the first 425 cases studied in the Department of Neurology and Psychiatry, NTUH, by Mode A ultrasonic pulse techniques in the diagnosis of intracranial lesions is presented and compared with the findings in EEG, angiogram, air study and operation. The overall diagnostic accuracy in predicting midline echo shifting is 95.3%. The degree of echo shift is shown to be more closely related to the shift of venous angle than that of the anterior cerebral artery. The benefit of the combined use of echo and EEG is stressed. A method aiming at decreasing the operator bias is presented.