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Inversion Recovery Fast Gradient Recalled Acquisition in the Steady StateInfoSheet: - Sequences -
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(IR FGR) A gradient echo sequence with an inversion pulse.

See Gradient Recalled Echo Sequence, Inversion Recovery and Steady State Free Precession.
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Inversion Recovery Sequence Timing Diagram (IR) The inversion recovery pulse sequence produces signals, which represent the longitudinal magnetization existing after the application of a 180° radio frequency pulse that rotates the magnetization Mz into the negative plane. After an inversion time (TI - time between the starting 180° pulse and the following 90° pulse), a further 90° RF pulse tilts some or all of the z-magnetization into the xy-plane, where the signal is usually rephased with a 180° pulse as in the spin echo sequence. During the initial time period, various tissues relax with their intrinsic T1 relaxation time.
In the pulse sequence timing diagram, the basic inversion recovery sequence is illustrated. The 180° inversion pulse is attached prior to the 90° excitation pulse of a spin echo acquisition. See also the Pulse Sequence Timing Diagram. There you will find a description of the components.
The inversion recovery sequence has the advantage, that it can provide very strong contrast between tissues having different T1 relaxation times or to suppress tissues like fluid or fat. But the disadvantage is, that the additional inversion radio frequency RF pulse makes this sequence less time efficient than the other pulse sequences.

Contrast values:
PD weighted: TE: 10-20 ms, TR: 2000 ms, TI: 1800 ms
T1 weighted: TE: 10-20 ms, TR: 2000 ms, TI: 400-800 ms
T2 weighted: TE: 70 ms, TR: 2000 ms, TI: 400-800 ms

See also Inversion Recovery, Short T1 Inversion Recovery, Fluid Attenuation Inversion Recovery, and Acronyms for 'Inversion Recovery Sequence' from different manufacturers.
 
Images, Movies, Sliders:
 Brain MRI Inversion Recovery  Open this link in a new window
    
 Knee MRI Sagittal STIR 002  Open this link in a new window
 Brain MRI Coronal FLAIR 001  Open this link in a new window
    
 
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• View the DATABASE results for 'Inversion Recovery Sequence' (8).Open this link in a new window

 
Further Reading:
  Basics:
The equation for a repeated inversion recovery sequence
Contrast mechanisms in magnetic resonance imaging
2004   by www.iop.org    
  News & More:
FLAIR Vascular Hyperintensity: An Important MRI Marker in Patients with Transient Ischemic Attack
Thursday, 14 July 2022   by www.dovepress.com    
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Inversion Recovery Spin Echo
 
(IRSE) Form of inversion recovery imaging in which the signal is detected as a spin echo. For TE short compared to the T2 relaxation time, there will be only a small effect of T2 differences on image intensities; for longer TE's, the effect of T2 may be significant.
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Further Reading:
  Basics:
Magnetic resonance imaging
   by www.scholarpedia.org    
Inversion TimeInfoSheet: - Sequences -
Intro, Overview, 
Types of, 
etc.
 
(TI) The time period between the 180° inversion pulse and the 90° excitation pulse in an inversion recovery pulse sequence. The inversion time controls the signal of different tissues and with the change of this parameter also fat and water suppression is attainable.
 
Images, Movies, Sliders:
 Knee MRI Sagittal STIR 002  Open this link in a new window
 Brain MRI Coronal FLAIR 001  Open this link in a new window
 
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• View the DATABASE results for 'Inversion Time' (14).Open this link in a new window

 
Further Reading:
  News & More:
Study identifies new way to predict prognosis for heart failure patients
Tuesday, 10 December 2013   by medicalxpress.com    
Inversion Transfer
 
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