T1W, T2W, PDW

Weighting in MRI is explained.
T1W: highlight T1 contrast (short TR) while diminishing T2 contrast (short TE)
T2W: highlight T2 contrast (long TE) while diminishing T1 contrast (long TR)
PDW: diminish both T1 (long TR) and T2 (short TE) contrast so only spin density is observed

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