Determining the nature of brain lesions by electroencephalography
First Claim
1. A method of determining the electrical output of a brain region in the head of a subject comprising obtaining first data representative of energy in the brain region in a primary frequency domain, determining second data representative of energy in the primary frequency domain substantially simultaneously relative to the energy in a secondary frequency domain, and relating the first data with the second data thereby obtaining a value representative of electrical output in the brain region.
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Abstract
Determining brain lesions by quantified electroencephalography is effected by obtaining absolute power data in a primary frequency domain for a brain region. Power data in the primary frequency domain in relation to power in a secondary frequency domain is determined. The two sets of data are related to obtain a value representative of the electrical output in the brain region. The representative value is compared to a selected base value and quantified departures are mapped topographically. This map is used to identify and assess lesions associated with disorders and afflictions including dementia and demyelinating diseases.
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Citations
52 Claims
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1. A method of determining the electrical output of a brain region in the head of a subject comprising obtaining first data representative of energy in the brain region in a primary frequency domain, determining second data representative of energy in the primary frequency domain substantially simultaneously relative to the energy in a secondary frequency domain, and relating the first data with the second data thereby obtaining a value representative of electrical output in the brain region.
- 2. A method of determining the electrical output of a brain region in the head of a subject comprising obtaining first data representative of energy in the brain region in a primary frequency domain, determining second data representative of energy in the primary frequency domain relative to the energy in a secondary frequency domain, and relating the first data with the second data thereby obtaining a value representative of electrical output in the brain region, wherein relating is effected by determining the first data and second data relative to a selected base value and wherein when the first data and the second data both increase or decrease relative to the selected base value, a concordance condition is indicated, and wherein when one of the first data and the second data respectively increase or decrease relative to the selected base while the other of the first data or second data, respectively, is oppositely directed relative to the selected base, a discordance condition is indicated.
- 15. A method of determining the electrical output of a brain region in the head of a subject comprising obtaining first data representative of energy in the brain region in a primary frequency domain, determining second data representative of energy in the primary frequency domain relative to the energy in a secondary frequency domain, and relating the first data with the second data thereby obtaining a value representative of electrical output in the brain region, wherein the first data are divided by a selected first data value, and the second data are divided by a selected second data value thereby to obtain a normalized base value for normalizing the first data, and a normalized base for normalizing the second data, respectively, and wherein the first data relative to the normalized base value of the first data and the second data relative to the normalized base value of the second data yields concordance and discordance indications.
- 17. A method of determining the electrical output of a brain region in the head of a subject comprising obtaining first data representative of energy in the brain region in a primary frequency domain, determining second data representative of energy in the primary frequency domain relative to the energy in a secondary frequency domain, and relating the first data with the second data thereby obtaining a value representative of electrical output in the brain region, wherein the first data are an absolute power, and the second data are a relative power, the absolute power being power measured by selected electrode channels over the primary frequency domain and the relative power being the distribution of power in the primary frequency domain relative to the power in the secondary frequency domain in the selected electrode channels.
- 19. A method of determining the electrical output of a brain region in the head of a subject comprising obtaining first data representative of energy in the brain region in a primary frequency domain, determining second data representative of energy in the primary frequency domain substantially simultaneously relative to the energy in a secondary frequency domain, and relating the first data with the second data thereby obtaining a representative value of electrical output in the brain region, including comparing the representative value with a selected base representative of the brain region and assessing from the comparison the physiology in the brain region.
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25. A method of determining the electrical output of a brain region in the head of a subject comprising obtaining first data representative of energy in the brain region in a primary frequency domain, determining second data representative of energy in the primary frequency domain relative to the energy in a secondary frequency domain, and relating the first data with the second data thereby obtaining a representative value of electrical output in the brain region, including diagnosing from the representative value the existence or non-existence of a brain lesion characterized by at least one of the disorders indicated by dementia, such disorders being selectively multi-infarct dementia, Alzheimer'"'"'s disease, Pick'"'"'s disease or a demyelinating disease, selectively, multiple sclerosis.
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26. A method of determining the electrical output of a brain region in the head of a subject comprising obtaining first data representative of energy in the brain region in a primary frequency domain, determining second data representative of energy in the primary frequency domain relative to the energy in a secondary frequency domain, and relating the first data with the second data thereby obtaining a value representative of electrical output in the brain region, including normalizing the effect of a selected energy distribution in the brain region, such region being selectively adjacent to at least one of the ears of the subject, the normalizing being effected by determining an energy measurement of different electrodes relative to data of at least one other electrode.
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27. A method of determining the electrical output of a brain region in the head of a subject comprising obtaining first data representative of energy in the brain region in a primary frequency domain, substantially simultaneously determining second data representative of energy in the primary frequency domain relative to the energy in a secondary frequency domain, relating the first data with the second data thereby obtaining a value representative of electrical output in the brain region, and obtaining a brain map of the representative value.
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28. A method of determining the electrical output of a brain region in the head of a subject comprising obtaining first data representative of energy in the brain region in a primary frequency domain, determining second data representative of energy in the primary frequency domain relative to the energy in a secondary frequency domain, and relating the first data with the second data thereby obtaining a representative value of electrical output in the brain region, and obtaining a brain map of the representative value including obtaining a normalized base value for the first data and a normalized base for the second data respectively, obtaining simultaneously selected base values from the normalized base values and obtaining the representative value based on departures from the selected base values.
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29. A method of determining the electrical output of a brain region in the head of a subject comprising obtaining first data representative of energy in the brain region in a primary frequency domain, determining second data representative of energy in the primary frequency domain relative to the energy in a secondary frequency domain, and relating the first data with the second data thereby obtaining a representative value of electrical output in the brain region, and obtaining a brain map of the representative value including comparing the representative value with a simultaneously obtained selected base representative of the brain region and assessing from the comparison the physiology in the brain region.
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30. A method of determining the electrical output of a brain region in the head of a subject comprising obtaining first data representative of energy in the brain region in a primary frequency domain, substantially simultaneously determining second data representative of energy in the primary frequency domain relative to the energy in a secondary frequency domain, normalizing the first data, normalizing the second data, selecting a simultaneously obtained base value relative to the respective normalizations, determining departures of the first data and the second data from the respective selected base values, and relating the departures thereby to obtain a brain map representative of electrical output in the brain region.
- 31. A method of determining the electrical output of a brain region in the head of a subject comprising obtaining first data representative of energy in the brain region in a primary frequency domain, determining second data representative of energy in the primary frequency domain relative to the energy in a secondary frequency domain, normalizing the first data, normalizing the second data, selecting a base value relative to the respective normalizations, determining departures of the first data and the second data from the respective selected base values, and relating the departures thereby to obtain a brain map representative of electrical output in the brain region, including having multiple primary frequency domains and including effecting mapping for the multiple primary frequency domains.
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33. A method of determining the electrical output of a brain region in the head of a subject comprising measuring an absolute power in the brain region in a primary frequency domain, substantially simultaneously determining a relative power in the primary frequency domain relative to the absolute power in a secondary frequency domain, normalizing the absolute power, normalizing the relative power, selecting a simultaneously obtained base value relative to the respective normalizations, determining departures of the absolute power and the relative power from the respective selected base values, and relating the departures thereby to obtain a cordance brain map representative of electrical output in the brain region.
- 34. A method of determining the electrical output of a brain region in the head of a subject comprising measuring an absolute power in the brain region in a primary frequency domain, determining a relative power in the primary frequency domain relative to the absolute power in a secondary frequency domain, normalizing the absolute power, normalizing the relative power, selecting a base value relative to the respective normalizations, determining departures of the absolute power and the relative power from the respective selected base values, and relating the departures thereby to obtain a cordance brain map representative of electrical output in the brain region, including obtaining a topographical map of the representative values in a primary frequency domain.
- 37. Apparatus for determining the electrical output of a brain region in the head of a subject comprising means for obtaining first data representative of an energy in the brain region in a primary frequency domain, means for determining substantially simultaneously second data representative of energy in the primary frequency domain relative to the energy in a secondary frequency domain, and means for relating the first data with the second data thereby obtaining a value representative of electrical output in the brain region.
- 41. Apparatus for determining the electrical output of a brain region in the head of a subject comprising means for obtaining first data representative of an energy in the brain region in a primary frequency domain, means for determining second data representative of energy in the primary frequency domain relative to the energy in a secondary frequency domain, and means for relating the first data with the second data thereby obtaining a value representative of electrical output in the brain region, including means for determining a selected base value, the value being selectively normalized, means for relating the first data and second data relative to the selected base value, and means for determining selectively concordance and discordance conditions of the first data and second data relative to the selected base value.
- 49. Apparatus for determining the electrical output of a brain region in the head of a subject comprising means for obtaining first data representative of an energy in the brain region in a primary frequency domain, means for determining second data representative of energy in the primary frequency domain relative to the energy in a secondary frequency domain, and means for relating the first data with the second data thereby obtaining a value representative of electrical output in the brain region including means for comparing the first data to a selected base value of the first data and means for comparing the second data to a selected base value of the second data, including means for quantifying an amount of a departure of the first data from a selected base value and the amount of departure of the second data from a selected base value.
Specification