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Summary
• MRI is a versatile technique
– different types of anatomical contrast: T1 and T2
– functional techniques: DWI, DCE-MRI
• Multiple sequences can be scanned within a single exam
• Spins precess at the Larmor frequency: ω
0
=
γ
·B
0
• Gradient magnets are used for spatial encoding
• Non-linearities in gradients and distortions in magnetic field
result in geometrical distortions
• Reducing water-fat shift improves geometrical integrity at the
cost of SNR