Exam-style question
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What is the primary role of strong magnetic fields in MRI?.
- A.To generate sound waves for imaging
- B.To align hydrogen nuclei in the body
- C.To create ionising radiation for imaging
- D.To enhance the visibility of tissues
Model answer
What a good answer should say
- To align hydrogen nuclei in the body
Explanation
Why this works
Strong magnetic fields in MRI are used to align the hydrogen nuclei in the body, which is essential for producing detailed images of internal structures. This alignment allows for the subsequent application of radio-frequency pulses to excite the nuclei, leading to signal detection and image formation.
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