There are multiple definitions:

1. frequency response function(English)

   • EMG, IEMG
   • Electrophysiology, Signal analysis

2. fasting-reduced factor(English)

   • dietary intervention as a promising adjunct for cancer therapy
   • AKT, BC, ER, ET, FMD, mTOR, PI3K, PTEN
   • Diet, Oncology, Mammary gland
   • https://doi.org…392-020-00271-y

3. free-running framework(English)

   • enables respiratory and cardiac motion resolved (5D) whole-heart imaging without ECG, breath-holds, or expert scan plane planning
   • bSSFP, CMR, FISS, LVEF
   • Medical imaging, Cardiology
   • https://doi.org…cmr.2026.102784