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Summary 1
• Many reasons exists for artifacts in images
– Erroneous sampling of k-space
• Aliasing
• Ringing
– Magnetic field errors
• Gradient artifacts
• Susceptibility artifacts
• Water-fat shift
• Geometrical artifacts show up in a particular direction
– Phase encoding direction: aliasing
– Read-out direction: susceptibility, water-fat shift
• Dephasing results in signal loss in gradient echo sequences