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FID

Free Induction Decay

FIDS

Fitting of Doublets and Singlets

FieldMap

MRI: Quantitative B0 mapping, part of the MAPSHIM tool for localized high-order shimming

FIRFT

Fast Inversion-Recovery Fourier Transform

FISP

MRI: Fast gradient echo with steady state signal selection (FID, echo or fully balanced) and optional inversion recovery for T1 mapping. (Equivalent acronyms: FLASH, FAST, FISP, PSIF, CE-FAST, SSFP, GRASS, TrueFISP)