Surgery – Diagnostic testing – Detecting brain electric signal
Patent
1997-05-07
1998-08-25
Bahr, Jennifer
Surgery
Diagnostic testing
Detecting brain electric signal
600545, 600546, A61B 505
Patent
active
057978530
ABSTRACT:
An apparatus and method for automatically determining an individual's level of brain function is provided. EEG or MEG signals are collected amplified and digitized. The signals are then passed to a computer comprising a CPU, ROM and RAM, an input interface for collecting and filtering the scalp potential signals and an output interface for displaying the resulting information on a display device such as a printer or CRT. The computer determines the position of these signals in reference to the interpolated 3-D geometry of the subject's head. The dipolarity of a particular point is iteratively and empirically derived by comparing the values of these measured signals to a test signal and the error between the two is minimized. The procedure is repeated for the complete series of electrodes placed on the skull. The mean dipolarity of a subject is then determined for a given time frame. The subject's dipolarity is then compared against that of age matched subjects and scaled so that an estimation of the subjects degree of cognitive loss is determined.
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Musha Toshimitsu
Terasaki Omi
Bahr Jennifer
Cardwell Douglas A.
Huang Stephen
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