Task 4 - Techniques of scanning Flashcards
Invasive
Procedure that enters body
- > usually by cutting or puncturing skin
- > interrupts normal bodily function
Non-Invasive
No break in the skin is created
Density reflects..
Reflects the structure of the brain
Blood flow reflects..
reflects metabolism of brain
Electromagnetic activity reflects..
the electrical activity of brain
Computerized Axial Tomography (CAT)
- noninvasive
- examine brain structure through analysis of X-ray absorption
- several positions around the head
advantages of CAT
3
-quick
-accommondates large patiens
-high spatial resolution
(LOWER THAN MRI)
-option 3D
disadvantages of CAT
2
- can damage DNA (bcs radiation)
- Medicore temporal Resolution
Positron Emission Tomography (PET)
- examine brain function
- info about blood flow and how our body’s using oxygen and sugar
- patients get radioactive bla injected into carotid artery
Advantage of PET
3
-High spatial reso
-helps doc to test for disease, how well treatment are working
(Cancer, heart, brain)
-Alzheimer, Parkinsons, seizure, stroke tumors
Image explanation of PET
– Each scan is a horizontal section
- during different cognitive or perceptual task
- Areas of high activity are reds and yellows.
Disadvantage of PET
3
-low temporal resolution
(Lower than MRI but better than CT)
-Does not provide images of brain structure Resolved by combining PET with MRI
-body stays radioactive for a short time
Transcranial Magnetic Stimulation (TMS)
- noninvasive
- stimulation of cortex through application of strong magnetic fields
- best scanning tech to treat depression
Magnetic stimulation
created to induce small electric current (compared to EEG) in specific parts of the brain
-> without causing seizure or loss of consciousness
pro TMS
-used to map behavior
-help with stroke rehabilitation
-parkinsoms
migraine, pain mamagement