Electroencephalogram diagnosis apparatus and method
First Claim
1. An electroencephalogram diagnosis apparatus comprising:
- an input unit for inputting time-series electroencephalographic data;
a phase analysis unit for plotting a time derivative dV/dt of cerebral evoked potential V with respect to the cerebral evoked potential V based on the time-series electroencephalographic data to form an electroencephalographic locus on a phase plane V-dV/dt;
a feature parameter calculating unit for calculating feature parameters on the phase plane V-dV/dt formed by the phase analysis unit;
a reference space forming unit for forming a reference space using reference learning data concerning the feature parameters;
a separation index calculating unit for calculating a separation index between the calculated feature parameters and the reference space;
a judgment unit for judging existence/absence of disease including neurological disease based on the calculated separation index;
an output unit for outputting existence/absence of disease of a subject based on a judgment result of the judgment unit; and
inspection electrodes for measuring electroencephalogram of the subject number of which is less than ten.
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Abstract
Measuring electrodes are disposed in positions T5 and T6 according to the international 10-20 system. Electroencephalographic data obtained from these measuring electrodes is received in an input portion, and converted into phase analysis data on a phase plane V-dV/dt by a phase analysis portion. By use of a set of feature parameters selected from an aspect ratio, a V-axis maximum value, a sub/total revolution number ratio and an RL/UB distribution ratio in a feature parameter calculating portion, a Mahalanobis distance is calculated in a Mahalanobis distance calculating portion. The abnormality of the electroencephalogram is judged on the basis of the Mahalanobis distance, and a result of the judgment is outputted.
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Citations
20 Claims
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1. An electroencephalogram diagnosis apparatus comprising:
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an input unit for inputting time-series electroencephalographic data;
a phase analysis unit for plotting a time derivative dV/dt of cerebral evoked potential V with respect to the cerebral evoked potential V based on the time-series electroencephalographic data to form an electroencephalographic locus on a phase plane V-dV/dt;
a feature parameter calculating unit for calculating feature parameters on the phase plane V-dV/dt formed by the phase analysis unit;
a reference space forming unit for forming a reference space using reference learning data concerning the feature parameters;
a separation index calculating unit for calculating a separation index between the calculated feature parameters and the reference space;
a judgment unit for judging existence/absence of disease including neurological disease based on the calculated separation index;
an output unit for outputting existence/absence of disease of a subject based on a judgment result of the judgment unit; and
inspection electrodes for measuring electroencephalogram of the subject number of which is less than ten. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An electroencephalogram diagnosis method comprising:
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measuring electroencephalographic data of a subject with less than ten inspection electrodes;
inputting time-series electroencephalographic data;
plotting a time derivative dV/dt of cerebral evoked potential V with respect to the cerebral evoked potential V based on the time-series electroencephalographic data to form an electroencephalographic locus on a phase plane V-dV/dt;
calculating feature parameters on the phase plane V-dV/dt formed by the plotting step;
forming a reference space using reference learning data concerning the feature parameters;
calculating a separation index between the calculated feature parameters and the reference space;
judging existence/absence of disease including neurological disease based on the calculated separation index; and
outputting existence/absence of disease of the subject based on a judgment result of the judging step. - View Dependent Claims (16, 17)
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18. A recording medium readable by a computer and recording an electroencephalogram computer diagnosis program making the computer execute:
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inputting time-series electroencephalographic data using less than ten inspection electrodes;
plotting a time derivative dV/dt of cerebral evoked potential V with respect to the cerebral evoked potential V based on the time-series electroencephalographic data to form an electroencephalographic locus on a phase plane V-dV/dt;
calculating feature parameters on the phase plane V-dV/dt formed by the plotting step;
forming a reference space using reference learning data concerning the feature parameters;
calculating a separation index between the calculated feature parameters and the reference space;
judging existence/absence of disease including neurological disease based on the calculated separation index; and
outputting existence/absence of disease of the subject based on a judgment result of the judging step. - View Dependent Claims (19, 20)
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Specification