Topic Index

Study MRI physics using interactive questions and answers. Choose a topic.

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Topic Index - f

• Faraday cage
  • RF screen
• Faraday's law
  • heart valves and the Lenz effect
• FastSPGR, see turbo gradient echo
• fast spin echo (FSE), see turbo spin echo
• fat suppression
  • STIR
  • SPIR
• ferromagnetic implants
  • when to scan
• ferromagnetic foreign bodies
  • bullets, shrapnel etc
  • cosmetics
  • unconscious patient
• FID, see free induction decay
• FFT (fast Fourier transform
  • symmetric k-space
• fibrosis
  • aneurysm clips
  • heart valves
• fingerprint coils
  • gradient coil types
• filters (implants)
  • coils, stents and filters
• Fleming's left- & right-hand rules
  • heart valves and the Lenz effect
• flip angle
  • defined
  • partial flip angles decrease scan time
• flow related enhancement (FRE)
  • bright blood
• fluid suppression (FLAIR)
  • type of inversion recovery
• Fourier series
  • truncation of
• Fourier transform
  • what it does (i)
  • what it does (ii)
  • appropriate for MRI
  • which direction first
  • fast, see FFT
• FOV (field of view)
  • changing dimensions of, SNR effect
  • aliasing and
  • reduction in PE direction
  • rectangular (RFOV)
  • how far can we "zoom in", decreasing FOV
• fractional NEX, see partial Fourier
• free induction decay
  • oscillating decaying MRI signal
• frequency encoding
  • changing matrix size, SNR effect
  • vs. phase encoding, temporal comparison
  • gradient
  • gradient timing (i)
  • gradient timing (ii)
  • not possible in 2D
• fringe field
  • 0.5 mT line and Controlled Area
  • distance from the magnet

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