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A nonequilibrium state in which the macroscopic magnetization vector is oriented opposite to the magnetic field;; usually produced by adiabatic fast passage or 180° RF pulses.
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Inversion TimeInfoSheet: - Sequences - 
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(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.
 
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Further Reading:
  News & More:
Study identifies new way to predict prognosis for heart failure patients
Tuesday, 10 December 2013   by medicalxpress.com    
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Time Inversion
 
(TI) Inversion time. In inversion recovery, the time between the middle of initial (inverting) 180° RF pulse and middle of the subsequent exciting 90° pulse to detect the amount of longitudinal magnetization.
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(IR) Inversion recovery is an MRI technique, which can be incorporated into MR imaging, wherein the nuclear magnetization is inverted at a time on the order of T1 before the regular imaging pulse-gradient sequences. The resulting partial relaxation of the spins in the different structures being imaged can be used to produce an image that depends strongly on T1. This may bring out differences in the appearance of structures with different T1 relaxation times. Note that this does not directly produce an image of T1. T1 in a given region can be calculated from the change in the MR signal from the region due to the inversion pulse compared to the signal with no inversion pulse or an inversion pulse with a different inversion time. This sequence involves successive 180° and 90° pulses. The inversion recovery sequence is specified in terms of three parameters, inversion time (TI), repetition time (TR) and echo time (TE).
See also Inversion Recovery Sequence and FLAIR.
 
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Further Reading:
  Basics:
T1-weighted Phase Sensitive Inversion Recovery for Imaging Multiple Sclerosis Lesions in the Cervical Spinal Cord(.pdf)
   by www.healthcare.siemens.com    
Contrast mechanisms in magnetic resonance imaging
2004   by www.iop.org    
  News & More:
Accurate T1 Quantification Using a Breath-hold Inversion Recovery TrueFISP Sequence
2003   by rsna2003.rsna.org    
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Inversion Transfer
 
See Saturation Transfer.
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