9.2 - The Brain Flashcards
1
Q
Compare and contrast the use of CT with MRI scans for studying brain structure.
A
Both give 3D images.
CT uses x-ray, MRI uses radio waves.
MRI more expensive.
MRI has higher resolution than CT, CT can only identify larger structures.
2
Q
Suggest why functional magnetic resonance imaging is considered better than CT for studying brain function.
A
Can view brain activity directly.
Can see brain activity over time.
Safer as no x-rays used.
3
Q
Why does a tumour appear white in MRI scans when the rest of the brain tissue is grey?
A
Tumour and brain tissue have different densities.
Radiowaves absorbed in this area.
