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Biomedical Imaging 2

Biomedical Imaging 2. Class 9 – Electric and Magnetic Field Imaging: Electroencephalography (EEG), Magnetoencephalography (MEG). Part 1: Theory 04/02/08. Magnetic field from magnetic material. Electric field from electric sources. Magnetic field from bioelectric sources.

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Biomedical Imaging 2

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

  2. Magnetic field from magnetic material Electric field from electric sources Magnetic field from bioelectric sources Electric stimulation with electric field Electrotherapy Electric stimulation with magnetic field Magnetoelectrotherapy Magnetization of material Magnetotherapy Magnetic measurement of magnetic susceptibility Electric measurement of electric impedance Magnetic measurement of electric impedance Biological Contrast Mechanisms

  3. Membrane Microscopic Ion Concentrations

  4. Simplified Membrane, Ion Channel Depiction

  5. Membrane Microscopic Ion Currents

  6. Propagation of Ion Currents

  7. Propagation of Ion Currents

  8. Typical Voltage vs. Time Transients

  9. Interaction of Nerve and Muscle

  10. Electromyography (EMG)

  11. Examples of EMG Recordings

  12. Electrocardiography (ECG, EKG)

  13. Electrocardiography (ECG, EKG)

  14. Magnetocardiography (MCG)

  15. Magnetocardiography (MCG)

  16. Electric Transmission of Biological Information

  17. Electric Transmission of Biological Information

  18. Invasive Recording of Electric Activity

  19. Properties of Electrically Active Tissues

  20. “Typical” Central Nervous System (CNS) Neuron

  21. Microscopic/Internal → Macroscopic/External

  22. EEG and MEG Have Different Surface Effects

  23. EEG and MEG Have Different Surface Effects

  24. EEG and MEG Have Different Surface Effects

  25. EEG and MEG Have Different Surface Effects

  26. Typical Event-Related Potential (ERP) Measurement

  27. Averaging Across Repeats (Time-Series Analysis!)

  28. ERP Components

  29. But Can We Do ERP Imaging?

  30. Theoretical Advantages of MEG

  31. Spatial Resolution of MEG

  32. Spatial Resolution of MEG

  33. Comparison of Properties of Functional Brain Imaging Methods

  34. Measurement Apparatus

  35. Scale of Biomagnetic Fields

  36. MEG Helmet

  37. MEG Raw Data and Image

  38. Placement of EEG Electrodes

  39. Placement of EEG Electrodes

  40. Dependence of Amplitude on Position

  41. Spatial Sensitivity of an EEG Electrode Pair

  42. EEG Waveforms—Frequency Bands

  43. Power Spectrum of Typical EEG

  44. Behavioral Correlates of EEG Waveforms

  45. Locating Source of EEG Signal (e.g., Epileptic Focus)

  46. Locating Source of EEG Signal (e.g., Epileptic Focus)

  47. Locating Source of EEG Signal (e.g., Epileptic Focus)

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