Magnetic Resonance - Technology Information Portal Welcome to MRI Technology
Info
  Sheets


Out-
      side
 



 
 't2' 
SEARCH FOR    
 
  2 3 5 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
 T2            spin spin relaxation Time 
Searchterm 't2' was found in the Abbreviation Register. 
Result : Searchterm 't2' found in 8 terms [] and 147 definitions []
1 - 5 (of 155)     next
Result Pages : [1 2]  [3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 ... ]
Searchterm 't2' was also found in the following services: 
spacer
News  (13)  Resources  (5)  Forum  (56)  
 
T2*Forum -
related threads
 
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.
spacer
 
• Share the entry 'T2*':  Facebook  Twitter  LinkedIn  
 
• Related Searches:
    • In Phase
    • Haemoglobin
    • T2 Relaxation
    • Liver Imaging
    • Opposed Phase Image
 
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:
Resonance Health Limited (RHT.AX) Receives FDA Approval for MRI-Q Cardiac Iron T2* Test
Tuesday, 16 August 2011   by www.biospace.com    
Principles, Techniques, and Applications of T2*- based MR Imaging and Its Special Applications1
September 2009   by pubs.rsna.org    
MRI Resources 
Portals - Online Books - MRI Technician and Technologist Jobs - Sequences - General - MRI Training Courses
 
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.
spacer

• View the DATABASE results for 'T2 Star' (5).Open this link in a new window


• View the NEWS results for 'T2 Star' (5).Open this link in a new window.
MRI Resources 
Diffusion Weighted Imaging - MRI Training Courses - Used and Refurbished MRI Equipment - Software - Brain MRI - Lung Imaging
 
T2 TimeForum -
related threads
 
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
    
SlidersSliders Overview

 Knee MRI Transverse 002  Open this link in a new window
    
 
spacer

• View the DATABASE results for 'T2 Time' (16).Open this link in a new window

 
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: 
spacer
News  (13)  Resources  (5)  Forum  (56)  
 
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.
spacer

• View the DATABASE results for 'T2* Time' (2).Open this link in a new window

 
Further Reading:
  News & More:
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 
Quality Advice - Implant and Prosthesis pool - Safety Products - Spectroscopy pool - Abdominal Imaging - Coils
 
T2 WeightedForum -
related threads
 
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 2 000 ms) and TE less than T2 (typically 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
    
SlidersSliders Overview

 MRI Liver T2  Open this link in a new window
    
 
spacer

• 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:
Fast T2 weighted imaging by PSIF at 0.2T for interventional MRI.(.pdf)
   by cds.ismrm.org    
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
MRI Resources 
Jobs - Brain MRI - Mobile MRI - Musculoskeletal and Joint MRI - Software - Shoulder MRI
 
     1 - 5 (of 155)     next
Result Pages : [1 2]  [3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 ... ]
 Random Page
 
Share This Page
FacebookTwitterLinkedIn

MR-TIP    
Community   
User
Pass
Forgot your UserID/Password ?  



Difference between ARMRIT and ARRT is :
cost 
duration 
exam 
acceptance 
salary 
all 
none 

Look
      Ups





Magnetic Resonance - Technology Information Portal
Member of SoftWays' Medical Imaging Group - MR-TIP • Radiology-TIP • US-TIP • The-Medical-Market
Copyright © 2003 - 2014 SoftWays. All rights reserved. [ 2 September 2014]
Terms of Use | Privacy Policy | Advertising
 [last update: 2014-09-01 03:21:41]