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 T2            spin spin relaxation Time 
Searchterm 't2' was found in the Abbreviation Register. 
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T2*Forum -
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T2* (also called T2 Star) is composed of molecular interactions (spin spin relaxation) and local magnetic field non-uniformities. Caused by this the protons precess at slightly different frequencies. The T2* effect cause a rapid loss in coherence and transverse magnetization. The T2* time is less than the T2 time.

See also T2* Time, T2 Star.
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    • Gradient Echo
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Further Reading:
  Basics:
IMAGE CONTRAST IN MRI(.pdf)
   by www.assaftal.com    
T2* cardiac MRI allows prediction of severe reperfusion injury after STEMI
Tuesday, 9 November 2010   by www.medwire-news.md    
Introduction to MRI Physics, Page 9
   by www.simplyphysics.com    
  News & More:
Scientists create imaging 'toolkit' to help identify new brain tumor drug targets
Tuesday, 2 February 2016   by www.eurekalert.org    
Resonance Health Limited (RHT.AX) Receives FDA Approval for MRI-Q Cardiac Iron T2* Test
Tuesday, 16 August 2011   by www.biospace.com    
MRI effectively measures hemochromatosis iron burden
Saturday, 3 October 2015   by medicalxpress.com    
Principles, Techniques, and Applications of T2*- based MR Imaging and Its Special Applications1
September 2009   by pubs.rsna.org    
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T2 Star
 
(T2* or T two star) The observed time constant of the FID due to loss of phase coherence among spins oriented at an angle to the static magnetic field. Commonly due to a combination of magnetic field inhomogeneities, dB, and spin spin transverse relaxation, with the result of rapid loss in transverse magnetization and MRI signal. MRI signals can usually still be recovered as a spin echo in times less than or on the order of T2.
1/T2 * @ 1/T2 + Dw/2; Dw = gDB. The FID will generally not be exponential, so that T2* will not be unique.
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Further Reading:
  News & More:
Scientists create imaging 'toolkit' to help identify new brain tumor drug targets
Tuesday, 2 February 2016   by www.eurekalert.org    
MRI Resources 
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T2 TimeForum -
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The T2 relaxation time (spin spin relaxation time or transverse relaxation time), is a biological parameter that is used in MRIs to distinguish between tissue types and is termed 'Time 2' or T2. It is a tissue-specific time constant for protons and is dependent on the exchanging of energy with near by nuclei. T2 weighted images rely upon local dephasing of spins following the application of the transverse energy pulse. T2 is the decay of magnetization perpendicular to the main magnetic field (in an ideal homogeneous field).
Due to interaction between the spins, they lose their phase coherence, which results in a loss of transverse magnetization and MRI signal. After time T2 transverse magnetization has lost 63% of its original value. This tissue parameter determines the contrast.
The T2 relaxation is temperature dependent. At a lower temperature molecular motion is reduced and the decay times are reduced.
Fat has a very efficient energy exchange and therefore it has a relatively short T2.
Water is less efficient than fat in the exchange of energy, and therefore it has a long T2 time.

See also T2 Weighted Image and Magnetic Resonance Imaging MRI.
 
Images, Movies, Sliders:
 Breast MRI Images T2 And T1  Open this link in a new window
      
 MRI of the Skull Base  Open this link in a new window
    
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 Knee MRI Transverse 002  Open this link in a new window
    
 
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Further Reading:
  News & More:
MYELIN-SELECTIVE MRI: PULSE SEQUENCE DESIGN AND OPTIMIZATION
   by www.imaging.robarts.ca    
Searchterm 't2' was also found in the following services: 
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T2* Time
 
(T2 Star) The characteristic time constant that describes the decay of transverse magnetization, taking into account the inhomogeneity in static magnetic fields and the spin spin relaxation in the human body. This results in a rapid loss of phase coherence and the MRI signal. The T2* time is always less than the T2 time.
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Further Reading:
  News & More:
Iron Measurements with MRI Reveal Stroke's Impact on Brain
Tuesday, 12 March 2019   by www.rsna.or    
Automatic Mapping Extraction from Multiecho T2-Star Weighted Magnetic Resonance Images for Improving Morphological Evaluations in Human Brain
Wednesday, 5 June 2013   by www.hindawi.com    
T2* cardiac MRI allows prediction of severe reperfusion injury after STEMI
Tuesday, 9 November 2010   by www.medwire-news.md    
MRI Resources 
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T2 WeightedForum -
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Often used to indicate an image where most of the contrast between tissues or tissue states is due to differences in tissue T2 created typically by using longer TE and TR times.
This term may be misleading in that the potentially important effects of tissue density differences and the range of tissue T2 values are often ignored.
Choosing the machine parameters such that TR greater than T1 (typically greater than 2 000 ms) and TE less than T2 (typically greater than 100 ms) and noting that (1-exp(-TR/T1) = 1 for TR/T1 much greater than 1, will reduce Eq. 1 to the expression
Mxy = Mxy0exp(-TE/T2)
which is dependent on T2 only, hence the term T2 weighting. Therefore T2 weighted image contrast state is approached by imaging with a TR long compared to tissue T1 (to reduce T1 contribution to image contrast) and a TE between the longest and shortest tissue T2s of interest. A TR greater than 3 times the longest T1 is required for the T1 effect to be less than 5%. Due to the wide range of T1 and T2 and tissue density values that can be found in the body, an image that is T2 weighted for some tissues may not be so for others.
See also T2 Time.
Lesions with short T2 are (dark in T2 weighted sequences):
acute haemorrhage (deoxyHb)
haemosiderin
physiologic iron (basal ganglia, etc.)
mucinous lesions.
 
Images, Movies, Sliders:
 MRI Pancreas T2  Open this link in a new window
    
 Anatomic MRI of the Neck  Open this link in a new window
    
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 MRI Liver T2  Open this link in a new window
    
 
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• View the DATABASE results for 'T2 Weighted' (46).Open this link in a new window


• View the NEWS results for 'T2 Weighted' (1).Open this link in a new window.
 
Further Reading:
  Basics:
A paired dataset of T1- and T2-weighted MRI at 3 Tesla and 7 Tesla
Thursday, 27 July 2023   by www.nature.com    
Clinical evaluation of a speed optimized T2 weighted fast spin echo sequence at 3.0 T using variable flip angle refocusing, half-Fourier acquisition and parallel imaging
Wednesday, 25 October 2006
Fast T2 weighted imaging by PSIF at 0.2T for interventional MRI.(.pdf)
   by cds.ismrm.org    
  News & More:
Single Sequence Magnetic Resonance Imaging in Serous Otitis Media
Friday, 28 April 2023   by www.cureus.com    
Non-metallic T2-MRI agents based on conjugated polymers
Monday, 11 April 2022   by www.nature.com    
MRI T2 Mapping of the Knee Providing Synthetic Morphologic Images: Comparison to Conventional Turbo Spin-Echo MRI
Tuesday, 1 October 2019   by pubs.rsna.org    
New MRI technique offers faster diagnosis of multiple sclerosis
Monday, 1 February 2016   by medicalxpress.com    
MRI Resources 
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