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QUESTIONS
» Basic Physics

Where does the MRI signal come from? This section explores the basic physics of magnetic resonance imaging.

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MRI Basic Physics Q&A

These questions are concerned with the generation and evolution of the MRI signal. Creation of the MRI image is not covered in this section.

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  1. What is nuclear spin?
  2. Where do MRI signals come from?
  3. What happens to spins placed in a magnetic field, before a net magnetisation forms?
  4. How does net magnetisation form, from a classical perspective?
  5. "Nuclear magnetic resonance" and "magnetic resonance imaging". What is the resonance?
  6. What is the Larmor equation?
  7. Derive the Larmor equation from a classical perspective.
  8. How is the angular momentum which arises from nuclear spin quantized in the presence of an external magnetic field?
  9. What are the nuclear spin and azimuthal quantum numbers for the hydrogen nucleus?
  10. What is Zeeman splitting?
  11. Are spins restricted to the Zeeman energy-eigenstates?
  12. What is net spin polarisation?
  13. What is the quantum mechanical description of longitudinal magnetisation?
  14. What is the quantum mechanical description of transverse magnetisation?
  15. Derive the Larmor equation from a quantum mechanical perspective.
  16. Why is the MRI signal so small?
  17. Why do we measure the MRI signal perpendicular to the external magnetic field (in the transverse plane)?
  18. What is intra-voxel dephasing?
  19. What are the time constants T1 and T2?
  20. How do signal differences between tissue types arise from differences in T2?
  21. How do signal differences between tissue types arise from differences in T1?
  22. What is a free induction decay?
  23. What is T2*?
  24. How is proton-density weighting achieved?

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