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After RF excitation the spins will tend to return to their equilibrium distribution in which there is no transverse magnetization and the longitudinal magnetization is at its maximum value and oriented in the direction of the static magnetic field. The transverse magnetization decays toward zero with a characteristic time constant T2, and the longitudinal magnetization returns toward equilibrium with a characteristic time constant T1.
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Further Reading:
  Basics:
Musculoskeletal MRI at 3.0 T: Relaxation Times and Image Contrast
Sunday, 1 August 2004   by www.ajronline.org    
  News & More:
New technique could allow for safer, more accurate heart scans
Thursday, 10 December 2015   by www.gizmag.com    
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Spin Spin Relaxation Time
 
The spin spin relaxation time is the time the spins need to dephase in the transverse plane.
See T2 Time, and Transverse Relaxation Time.
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Further Reading:
  News & More:
MULTIEXPONENTIAL PROTON SPIN-SPIN RELAXATION IN MAGNETIC RESONANCE IMAGING OF HUMAN BRAIN TUMORS
Friday, 26 March 1999   by www.dkfz-heidelberg.de    
T2* cardiac MRI allows prediction of severe reperfusion injury after STEMI
Tuesday, 9 November 2010   by www.medwire-news.md    
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Transverse Relaxation Time
 
The T2 time constant, which determines the rate at which excited protons reach equilibrium, or go out of phase with each other. A measure of the time taken for spinning protons to lose phase coherence among the nuclei spinning perpendicular to the main field due to interaction between spins, resulting in a reduction in the transverse magnetization. The transverse magnetization value will drop from maximum to a value of about 37% of its original value in a time of T2.
 
Images, Movies, Sliders:
 Brain MRI Images Axial T2  Open this link in a new window
      

 Breast MRI 2 Transverse T2 001  Open this link in a new window
 
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Longitudinal Relaxation Time
 
The T1 time constant, which determines the rate at which excited protons return to equilibrium within the lattice. The longitudinal relaxation time is a measure of the time taken for spinning protons to realign with the external magnetic field. The magnetization will grow after excitation from zero to a value of about 63% of its final value in a time of T1.
See also T1 Time.
 
Images, Movies, Sliders:
 Brain MRI Images T1  Open this link in a new window
 Sagittal Knee MRI Images T1 Weighted  Open this link in a new window
 
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Spin Lattice Relaxation Time
 
(T1) The spin lattice relaxation time (also called longitudinal relaxation time and T1 Time) is a spin property, whereby the value changes between different tissues. By the spin lattice relaxation process, the longitudinal magnetization Mz achieve the equilibrium value Mz0. The T1 time constant is an exponential approach toward Mz0.
The equation for the magnetization at a time t will be (if at t=0 the longitudinal magnetization is Mz0):
Mz(t) = M0+(Mz (0) - Mz0) exp(t/T1)
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Further Reading:
  Basics:
Electron Spin Resonance
   by hyperphysics.phy-astr.gsu.edu    
  News & More:
MRI's inside story
Thursday, 4 December 2003   by www.economist.com    
MULTIEXPONENTIAL PROTON SPIN-SPIN RELAXATION IN MAGNETIC RESONANCE IMAGING OF HUMAN BRAIN TUMORS
Friday, 26 March 1999   by www.dkfz-heidelberg.de    
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