Why Fat Is Bright on Fast Spin-Echo MRI

Fat appears bright on fast spin-echo MRI because multiple 180° refocusing pulses reduce J-coupling-induced signal loss. This fundamental concept helps avoid mistaking fat for pathology on T2-weighted FSE images.

• From MRI Questions (Elster), a popular educational resource for MRI physics.
• Covers the role of J-coupling and the Carr-Purcell-Meiboom-Gill (CPMG) refocusing in preserving fat signal.
• Essential knowledge for radiology residents and technologists interpreting clinical MRI.

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