Exam-style question
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How do strong magnetic fields contribute to the imaging process in MRI?.
- A.By causing thermal energy changes
- B.By aligning protons in the magnetic field
- C.By emitting ionising radiation
- D.By increasing the speed of sound waves
Model answer
What a good answer should say
- By aligning protons in the magnetic field
Explanation
Why this works
In MRI, strong magnetic fields align protons in the body, particularly those in water molecules. This alignment is crucial for the imaging process, as it allows for the detection of signals when the protons return to their original state after being disturbed by radio-frequency pulses.
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