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BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 1 Biomedical Imaging 2 Class 9 – Electric and Magnetic Field Imaging: Electroencephalography (EEG), Magnetoencephalography.

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Presentation on theme: "BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 1 Biomedical Imaging 2 Class 9 – Electric and Magnetic Field Imaging: Electroencephalography (EEG), Magnetoencephalography."— Presentation transcript:

1 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 1 Biomedical Imaging 2 Class 9 – Electric and Magnetic Field Imaging: Electroencephalography (EEG), Magnetoencephalography (MEG). Part 1: Theory 04/02/08

2 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 2 Biological Contrast Mechanisms Electric stimulation with electric field Electrotherapy Electric stimulation with magnetic field Magnetoelectrotherapy Magnetization of material Magnetotherapy Electric field from electric sources Magnetic field from bioelectric sources Magnetic field from magnetic material Electric measurement of electric impedance Magnetic measurement of electric impedance Magnetic measurement of magnetic susceptibility

3 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 3 Microscopic Ion Concentrations Membrane

4 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 4 Simplified Membrane, Ion Channel Depiction

5 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 5 Microscopic Ion Currents Membrane

6 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 6 Propagation of Ion Currents

7 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 7 Propagation of Ion Currents

8 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 8 Typical Voltage vs. Time Transients

9 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 9 Interaction of Nerve and Muscle

10 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 10 Electromyography (EMG)

11 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 11 Examples of EMG Recordings

12 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 12 Electrocardiography (ECG, EKG)

13 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 13 Electrocardiography (ECG, EKG)

14 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 14 Magnetocardiography (MCG)

15 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 15 Magnetocardiography (MCG)

16 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 16 Electric Transmission of Biological Information

17 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 17 Electric Transmission of Biological Information

18 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 18 Invasive Recording of Electric Activity

19 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 19 Properties of Electrically Active Tissues

20 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 20 “Typical” Central Nervous System (CNS) Neuron

21 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 21 Microscopic/Internal → Macroscopic/External

22 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 22 EEG and MEG Have Different Surface Effects

23 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 23 EEG and MEG Have Different Surface Effects

24 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 24 EEG and MEG Have Different Surface Effects

25 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 25 EEG and MEG Have Different Surface Effects

26 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 26 Typical Event-Related Potential (ERP) Measurement

27 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 27 Averaging Across Repeats (Time-Series Analysis!)

28 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 28 ERP Components

29 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 29 But Can We Do ERP Imaging?

30 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 30 Theoretical Advantages of MEG

31 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 31 Spatial Resolution of MEG

32 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 32 Spatial Resolution of MEG

33 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 33 Comparison of Properties of Functional Brain Imaging Methods

34 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 34 Measurement Apparatus

35 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 35 Scale of Biomagnetic Fields

36 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 36 MEG Helmet

37 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 37 MEG Raw Data and Image

38 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 38 Placement of EEG Electrodes

39 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 39 Placement of EEG Electrodes

40 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 40 Dependence of Amplitude on Position

41 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 41 Spatial Sensitivity of an EEG Electrode Pair

42 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 42 EEG Waveforms—Frequency Bands

43 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 43 Power Spectrum of Typical EEG

44 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 44 Behavioral Correlates of EEG Waveforms

45 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 45 Locating Source of EEG Signal (e.g., Epileptic Focus)

46 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 46 Locating Source of EEG Signal (e.g., Epileptic Focus)

47 BMI2 SS08 – Class 9 “EEG-MEG 1” Slide 47 Locating Source of EEG Signal (e.g., Epileptic Focus)

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