Magnetic Resonance Imaging
Nuclear magnetic resonance, gradients, RF excitation, k-space, contrast, sequences, diffusion, acceleration, flow, artefacts, safety and QA.
How to prepare for the current First FRCR
Build precise radiological-anatomy recall across modalities, then connect each Physics statement to image formation, quality, dose, safety and current UK regulation.
Core concepts
Concept 1
Nuclear magnetic resonance, gradients, RF excitation, k-space, contrast, sequences, diffusion, acceleration, flow, artefacts, safety and QA.
Exam cue: Follow net magnetisation through excitation, spatial encoding, signal acquisition, k-space filling and reconstruction.
Concept 2
Separate T1, T2 and T2-star effects, contrast weighting from quantitative mapping and sequence timing from image appearance.
Exam cue: Separate T1, T2 and T2-star effects, contrast weighting from quantitative mapping and sequence timing from image appearance.
Risk pitfalls and guardrails
Memorising sequence names without linking pulse timing and k-space choices to signal, scan time, artefact and safety.
Guardrail: Do not answer from pattern familiarity alone; verify orientation, mechanism, units, assumptions and current terminology.
Memory anchors
What establishes the MR resonance frequency?
The gyromagnetic ratio multiplied by the local magnetic field strength gives the Larmor frequency.
What do gradients contribute to MRI?
Slice selection and spatial frequency and phase encoding, as well as diffusion and flow sensitivity in relevant sequences.
What is k-space?
The spatial-frequency data matrix from which the image is reconstructed; its centre and periphery contribute differently to image contrast and detail.
What are the three broad MR safety fields?
Static magnetic field, switched gradients and radiofrequency energy, each with distinct projectile, stimulation, heating and device risks.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
Which nuclei provide most routine clinical MRI signal?
What is the Larmor frequency proportional to?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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