Magnetic Resonance Imaging (MRI)

Question 1

How does MRI work?

Answer 1

Radiofrequency transmitter produces an electromagnetic field
This aligns protons within body tissues
After the field is turned off, the protons revert to their original state
The difference between the two energy states, which is released as a photon, is measured

Question 2

What is Tesla?

Answer 2

International System Unit for the strength of a magnetic field

Question 3

What is the magnetic field strength of most medical MRI machines?

Answer 3

0.5-3 Tesla

Question 4

Which structures appear bright, and which appear dark on a T1-weighted MRI?

Answer 4

Fat = bright

Water/fluid appears dark

Question 5

Which structures appear bright, and which appear dark on a T2-weighted MRI?

Answer 5

Fat = dark

Water/fluid appears bright

Question 6

What is Weber?

Answer 6

SIU for magnetic flux