The NMR Phenomenon: Resonance
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Resonance Q&A's
- You seem to use MR, MRI and NMR interchangeably. Are there any differences among these terms?
- Who discovered NMR?
- How does B1 tip the net magnetization (M)?
- Why does the RF-field have to be applied at the Larmor frequency for resonance to occur?
- What is meant by flip angle?
- Are the individual nuclei still precessing after a 180°-pulse?
- Why are all the spins brought into phase with one another after a 90°-pulse? I don't understand why this should happen.
- When a group of spins is driven into higher energy levels by the action of an RF field, why don't these spins immediately release the absorbed energy and drop back to their original lower energy states?
- What is the rotating frame of reference?
- What happens if the B1 field is applied "off resonance" (i.e., not exactly at the Larmor frequency)?
- What is adiabatic excitation?
- How do adiabatic pulses differ from regular RF-pulses? What are they used for?
Resonance Topics