1991 Fiscal Year Final Research Report Summary
A clinical study on synthetic dynamic EEG topography of epilepsy
| Project/Area Number |
01570799
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Cerebral neurosurgery
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| Research Institution | Akita University School of Medicine |
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Principal Investigator |
KOWADA Masayoshi Akita University, Dept. of Neurosurg., 医学部, 教授 (50006706)
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| Co-Investigator(Kenkyū-buntansha) |
KIKUCHI Kenji Akita University, Dept. of Neurosurg., 医学部, 講師 (40125711)
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| Project Period (FY) |
1989 – 1991
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| Keywords | Epilepsy / Spike / Topography / EEG |
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| Research Abstract |
EEGs were recorded through 24 channels, including 16 channels out of the international 10-20 system and 8 channels on the bilateral paramedian line. A montage matching a 5 x 6 point matrix was designed, including imaginary values for the display. EEG processing was performed using ATAC450(32K with auxiliary disc 265K). 1)For the detection of spike, three parameters were used ; the second derivative, duration and amplitude. To study the spike detection rate, the results were compared with ones by inspection of three electroencephalographers in 182 samples, and the detection rate was 89.7%. 2)A square root of the mean power in each frequency band of EEG was defined as an equipotential value. The analytical time for EEG was optional at a unit of 2.007 second per epoch, and an interspike interval histogrammatching the sampling interval was prepared. As a result of simultaneous input of the EEG topography and interspike interval histogram datum, the composed images were consecutively processed for each sampling interval, demonstrating serial changes in epileptic EEG as a dynamic topography. 3)The forms of spike were assessed automatically by three measures, (a)a ratio of the ascending slope to the descending slope, (b)a ratio of the latter half of the ascending slope to the first of the descending slope, and(c)a ratio of duration of the ascending slope measured from the takeoff point to the peak to that of the descending slope. Correlation between these measures were investigated. Since the third measure was found to be well correlated to the first and was technically simple, the forms of spike were evaluated by the third measure, and were characterized by three kind of triangles. These triangles were allocated to the corresponding electrode locations together with the spike isoelectrogram.
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Research Products
(3 results)
