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Electrocorticography
ECoG
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ECoG ??? Recording electrical signal in brain How? Searching what?
Placing electrodes on surface of the brain Craniotomy or Burr holes Searching what? Epileptic zones What is that? Epileptic seizers
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Why not EEG??? Resource :
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History at a glance 1930 – Dr. Wilder Penfield developed “Montreal Procedure” to detect “auras” 1948 – Rudolf M. Hess conducted first scalp EEG 1949 – Hugo Krayenbuhl and Hess first attempt ECoG 1950 – Herbart Jasper and Dr. Wilder combined both to develop ECoG method
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Functions Electrode placement Monitoring Signal acquirer Electrodes
g.USBamp Filtering
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Clinical usage Where this is being used?
Pre surgical planning Evaluating the success of the surgery For research aspects Flexible in stimulating and recording signal but Limited field of view and influence of anesthetic
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Limitations Spontaneous brain activities Seizures are rarely recorded
Needs quick decisions Limited sampling time Limited field of view Influence of anesthetics
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Two forms Extra-operative ECoG Intra-operative ECoG
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Two forms… (ctd) Extra-operative ECoG Before a resectioning
EEG and MRI is also used Structural lesion Identifying exact place
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Two forms… (ctd) Intra-operative ECoG While resectioning
Monitor alleged tissue Localizing critical zones
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Research applications
Brain Computer Interface Neural signal interface Hybrid invasive Reference -
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Specifications Typical time for an investigation? 40 min
Investigating time period? 1- 2 weeks Temporal resolution? 5 ms Spatial resolution? 1 cm
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Safety concerns Invasive Minor mistakes but Major cost
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Risk Assessment Maintenance Strategy Worksheet Clinical function
Physical risk Problem avoidance probability Incident history Manufacturer requirement
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Any questions?
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