MRI : sMRI and DTI - Basic principles of MRI
3 important questions on MRI : sMRI and DTI - Basic principles of MRI
What is the basic idea of MRI?
- Water molecules respond differently in different tissues to a magnetic field
- can distinguish different brain tissues based on alignment of the protons in response to this magnetic field
How does the MRI scanner work?
- Constantly active field called "B0 field" with lots of different coils
- body ratio frequency coil = causes alignment of protons
- strength of magnetic field is typically 1,5 or 3 Tesla
What does higher field strength cause?
+:
-:
NO metal near an MRI!
- higher signal-t-noise ration
- higher spatial resolution
- higher temporal resolution
-:
- higher specific absorption rate
- more acoustic noise
NO metal near an MRI!
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