Electrocorticography ECo G ECo G Recording electrical signal

ECo. G ? ? ? • Recording electrical signal in brain • How? •

Why not EEG? ? ? Resource : http: //meg. aalip. jp/vs. EEGE. html

History at a glance • 1930 – Dr. Wilder Penfield developed “Montreal Procedure” to

Functions • Electrode placement • Electrodes • Monitoring • Signal acquirer • g. USBamp

Clinical usage • Where this is being used? • Pre surgical planning • Evaluating

Limitations • • • Spontaneous brain activities Seizures are rarely recorded Needs quick decisions

Two forms • Extra-operative ECo. G • Intra-operative ECo. G www. thechildren. com/departments-and-staff/departments/department-of-neurophysiology

Two forms… (ctd) • Extra-operative ECo. G • Before a resectioning • EEG and

Two forms… (ctd) • Intra-operative ECo. G • While resectioning • Monitor alleged tissue

Research applications • Brain Computer Interface • Neural signal interface • Hybrid invasive Reference

Specifications • Typical time for an investigation? ü 40 min • Investigating time period?

Safety concerns • Invasive • Minor mistakes but Major cost

Risk Assessment • Maintenance Strategy Worksheet • • • Clinical function Physical risk Problem

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Electrocorticography ECo. G

ECo. G ? ? ? • Recording electrical signal in brain • How? • Placing electrodes on surface of the brain • Craniotomy or Burr holes • Searching what? • Epileptic zones • What is that? • Epileptic seizers

Why not EEG? ? ? Resource : http: //meg. aalip. jp/vs. EEGE. html

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 ECo. G • 1950 – Herbart Jasper and Dr. Wilder combined both to develop ECo. G method

Functions • Electrode placement • Electrodes • Monitoring • Signal acquirer • g. USBamp • Filtering

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

Limitations • • • Spontaneous brain activities Seizures are rarely recorded Needs quick decisions Limited sampling time Limited field of view Influence of anesthetics

Two forms • Extra-operative ECo. G • Intra-operative ECo. G www. thechildren. com/departments-and-staff/departments/department-of-neurophysiology

Two forms… (ctd) • Extra-operative ECo. G • Before a resectioning • EEG and MRI is also used » Structural lesion • Identifying exact place

Two forms… (ctd) • Intra-operative ECo. G • While resectioning • Monitor alleged tissue • Localizing critical zones

Research applications • Brain Computer Interface • Neural signal interface • Hybrid invasive Reference - http: //kin 450 -neurophysiology. wikispaces. com/Brain-Computer+Interface

Specifications • Typical time for an investigation? ü 40 min • Investigating time period? ü 1 - 2 weeks • Temporal resolution? ü 5 ms • Spatial resolution? ü 1 cm

Safety concerns • Invasive • Minor mistakes but Major cost

Risk Assessment • Maintenance Strategy Worksheet • • • Clinical function Physical risk Problem avoidance probability Incident history Manufacturer requirement

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