Apparatus and method for epileptic seizure detection using non-linear techniques
First Claim
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1. A method for automatically detecting an epileptic seizure in a patient comprising the steps of:
- (a) providing at least one channel of a patient'"'"'s raw brain wave data, called e-data, selected from the group consisting of electroencephalogram data and magnetoencephalogram data;
(b) separating the e-data into artifact data, called f-data, and artifact-free data, called g-data, while preventing phase distortions in the data;
(c) processing g-data through a low-pass filter to produce a low-pass-filtered version of g-data, called h-data;
(d) applying at least one nonlinear measure selected from the group consisting of time steps per cycle, kolmogorov entropy, first minimum in the mutual information function, and correlation dimension to at least one type of data selected from the group consisting of e-data, f-data, g-data, and h-data to provide at least one time serial sequence of nonlinear measures, from which at least one indicative trend selected from the group consisting of abrupt increases and abrupt decreases can be determined;
(e) comparing at least one indicative trend with at least one known seizure indicator; and
(f) determining from said comparison whether an epileptic seizure is occurring in the patient.
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Abstract
Methods and apparatus for automatically detecting epileptic seizures by monitoring and analyzing brain wave (EEG or MEG) signals. Steps include: acquiring the brain wave data from the patient; digitizing the data; obtaining nonlinear measures of the data via chaotic time series analysis; obtaining time serial trends in the nonlinear measures; determining that one or more trends in the nonlinear measures indicate a seizure, and providing notification of seizure occurrence.
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14 Claims
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1. A method for automatically detecting an epileptic seizure in a patient comprising the steps of:
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(a) providing at least one channel of a patient'"'"'s raw brain wave data, called e-data, selected from the group consisting of electroencephalogram data and magnetoencephalogram data; (b) separating the e-data into artifact data, called f-data, and artifact-free data, called g-data, while preventing phase distortions in the data; (c) processing g-data through a low-pass filter to produce a low-pass-filtered version of g-data, called h-data; (d) applying at least one nonlinear measure selected from the group consisting of time steps per cycle, kolmogorov entropy, first minimum in the mutual information function, and correlation dimension to at least one type of data selected from the group consisting of e-data, f-data, g-data, and h-data to provide at least one time serial sequence of nonlinear measures, from which at least one indicative trend selected from the group consisting of abrupt increases and abrupt decreases can be determined; (e) comparing at least one indicative trend with at least one known seizure indicator; and (f) determining from said comparison whether an epileptic seizure is occurring in the patient. - View Dependent Claims (2, 3, 4, 5, 6)
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7. Apparatus for automatically detecting an epileptic seizure in a patient comprising:
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(a) data provision means for providing at least one channel of a patient'"'"'s raw brain wave data called e-data selected from the group consisting of electroencephalogram data and magnetoencephalogram data; (b) separation means for separating e-data into artifact data, called f-data, and artifact-free data, called g-data, while preventing phase distortions in the data, communicably connected to the data provision means; (c) low-pass filter means for filtering g-data to produce a low-pass filtered version of g-data, called h-data, communicably connected to the separation means; (d) application means for applying at least one nonlinear measure selected from the group consisting of time steps per cycle, Kolmogorov entropy, first minimum in the mutual information function, and correlation dimension to at least one type of data selected from the group consisting of e-data, f-data, g-data, and h-data to provide at least one time serial sequence of nonlinear measures, from which at least one indicative trend selected from the group consisting of abrupt increases and abrupt decreases can be determined, communicably connected to the low-pass filter means; (e) comparison means for comparing at least one indicative trend with known seizure indicators, communicably connected to the application means; and (f) determination means for determining from the comparison whether an epileptic seizure is occurring in the patient, communicably connected to the comparison means. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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Specification