Flip-Winkel

The flip angle is an MRI phenomenon by which the axis of the hydrogen proton shifts from its longitudinal plane (static magnetic field B0) Z axis to its transverse plane XY axis by excitation with the help of radiofrequency (RF) pulses. A RF pulse is sent in at the precise Larmor frequency in relation to the gyromagnetic ratio and magnetic field strength.

Related Radiopaedia articles

Imaging physics

• imaging physics
• imaging in practice
• imaging technology
• x-ray physics
  • ionizing radiation
  • interaction with matter​
    • Compton effect
    • photoelectric effect
    • pair production
    • coherent scattering
  • x-ray spectrum
    • bremsstrahlung
    • characteristic x-ray
  • radiation units
    • absorbed dose
      • gray
    • equivalent dose
      • sievert
  • effective dose
    • tissue weighting factor
  • exposure​
    • entrance skin dose
    • coulomb per kilogram
  • legacy units
    • curie
    • rad
    • rem
    • roentgen
    • rutherford
  • radiation safety
    • as low as reasonably achievable (ALARA)
    • radiation protection
    • background radiation
    • background radiation equivalent time
    • deterministic effect
    • dose limits
    • diagnostic reference level
    • inverse square law
    • lead apron
  • radiation damage (biomolecular)
  • radiation damage (skin injury)
  • stochastic effect
    • radiation-induced carcinogenesis
      • radiation-induced lung cancer
• CT physics 
• MRI physics
  • B0
  • chemical shift
  • dependence of magnetization (proton density, field strength and temperature)
  • echo time
  • eddy currents
  • electromagnetic induction
  • Ernst angle
  • flip angle
  • Larmor frequency
  • magnetic dipole magnetic field gradient
    • magnetic dipole moment
    • effect of gradient strength and bandwidth on slice thickness
  • magnetic susceptibility
  • magnetism​
    • diamagnetism
    • ferromagnetism
    • longitudinal and transverse magnetization
    • nuclear magnetization
    • paramagnetism
    • superparamagnetism
  • molecular tumbling rate effects on T1 and T2
  • net magnetization vector (NMV)
    • energy difference between spin up and spin down states
  • relaxation
    • T1 relaxation
      • T1 values (1.5 T)
      • factors affecting T1
    • T2 relaxation
    • T2* relaxation
  • repetition time
  • resonance and radiofrequency (RF)
  • units of magnetism
    • SI units
      • henry
      • tesla
      • weber
    • legacy units
      • gauss
      • maxwell
• ultrasound physics
  • absorption
  • acoustic impedance
  • attenuation
  • beam focusing
  • beam steering
  • decibel
  • Doppler effect
  • dynamic range
  • focal zone
  • frame rate
  • gain
  • line density
  • piezoelectric effect
  • power output
  • reflection
  • refraction
  • scattering
  • time gain compensation
  • ultrasound frequencies
• nuclear medicine physics 
  • atomic structure
  • isotopes
  • radioactive decay
    • alpha decay
    • beta decay
    • electron capture
    • gamma decay
    • half life
    • activity

Siehe auch:

• Grundlagen der Magnetresonanz-Tomographie