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• MRI is based on tomography.
• A slice in any plane can be imaged.
• Computers construct images.
• Spatial resolution is very good.
, • No imaging artifact from dense bone.
PET Pros and Cons
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Shows neural function, not structure:
• Blood flow, metabolic activity.
Limited spatial resolution (4-8 mm):
• Collision may be some distance from origin.
Only available in large centers:
• Cyclotron needed to produce isotopes.
Credentials:
'Apprentice' training to specialize
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Grad school only covers theoretical basics.
Do work with an experienced clinician in this area.
Head and neck cancer.
Trach and ventilator care.
,Central Nervous System
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• The brain & spinal cord.
• Gray matter for processing signals.
•White matter surrounds axons connecting neurons.
• Protected by the meninges (3 protective layers).
• Meninges are filled with cerebrospinal fluid which serves as an additional
barrier.
• Blood brain barrier.
Upper Motor Neurons
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• Not an anatomic description, but a role in a hierarchy.
• Central nervous system - both origin and destination.
• Both direct and indirect pathways.
• Complex inter-connections.
• Originating, planning, refining movements.
Neuromuscular Junction
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• Synapse connects axon terminal button to muscle fiber.
• Acetylcholine released by nerve.
• Receptors on muscle fiber.
• Electrochemical event contracts fiber.
• Botox destroys this junction.
Aphasia Groups, Social Benefits
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• I'm not the only one this has happened to.
• Supportive environment.
Brain Lobes:
Occipital
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Vision.
Understanding and interpreting the visual world around us.
Impact of Circulation Loss, MCA (Middle Cerebral Artery)