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


Out-
      side
 



 
 'Longitudinal Relaxation' 
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
Result : Searchterm 'Longitudinal Relaxation' found in 3 terms [] and 7 definitions [], (+ 11 Boolean[] results
1 - 5 (of 21)     next
Result Pages : [1]  [2]  [3 4 5]
MRI Resources 
Liver Imaging - Anatomy - MR Myelography - Raman Spectroscopy - MRI Reimbursement - Examinations
 
Longitudinal Relaxation
 
Return of longitudinal magnetization to its equilibrium value after excitation;; requires exchange of energy between the nuclear spins and the lattice. See also T1 Time.
spacer
 
• Share the entry 'Longitudinal Relaxation':  Facebook  Twitter  LinkedIn  
 
• Related Searches:
    • T1 Time
    • Proton
    • Relaxation Effect
    • T2 Relaxation
    • Precess
MRI Resources 
Safety Training - Non-English - Health - Jobs pool - Jobs - Used and Refurbished MRI Equipment
 
Longitudinal Relaxation Rate
 
(R1/R2) The longitudinal relaxation rate is equal to reciprocal of relaxation time.
spacer

• View the DATABASE results for 'Longitudinal Relaxation Rate' (3).Open this link in a new window

 
Further Reading:
  Basics:
Measuring T1 and T2 Relaxation - Introductory NMR & MRI from Magritek
   by www.azom.com    
MRI Resources 
Open Directory Project - Homepages - Health - Contrast Enhanced MRI - MRI Physics - MRI Technician and Technologist Jobs
 
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
 
spacer

• View the DATABASE results for 'Longitudinal Relaxation Time' (5).Open this link in a new window

MRI Resources 
Guidance - Functional MRI - Breast MRI - Most Wanted - Jobs pool - NMR
 
T1 TimeForum -
related threads
 
The T1 relaxation time (also called spin lattice or longitudinal relaxation time), is a biological parameter that is used in MRIs to distinguish between tissue types. This tissue-specific time constant for protons, is a measure of the time taken to realign with the external magnetic field. The T1 constant will indicate how quickly the spinning nuclei will emit their absorbed RF into the surrounding tissue.
As the high-energy nuclei relax and realign, they emit energy which is recorded to provide information about their environment. The realignment with the magnetic field is termed longitudinal relaxation and the time in milliseconds required for a certain percentage of the tissue nuclei to realign is termed 'Time 1' or T1. Starting from zero magnetization in the z direction, the z magnetization will grow after excitation from zero to a value of about 63% of its final value in a time of T1. This is the basic of T1 weighted images.
The T1 time is a contrast determining tissue parameter. Due to the slow molecular motion of fat nuclei, longitudinal relaxation occurs rather rapidly and longitudinal magnetization is regained quickly. The net magnetic vector realigns with B0 leading to a short T1 time for fat.
Water is not as efficient as fat in T1 recovery due to the high mobility of the water molecules. Water nuclei do not give up their energy to the lattice (surrounding tissue) as quickly as fat, and therefore take longer to regain longitudinal magnetization, resulting in a long T1 time.
See also T1 Weighted Image, T1 Relaxation, T2 Weighted Image, and Magnetic Resonance Imaging MRI.
 
Images, Movies, Sliders:
 Anatomic MRI of the Knee 2  Open this link in a new window
    
SlidersSliders Overview

 Breast MRI Images T2 And T1  Open this link in a new window
 Brain MRI Images T1  Open this link in a new window
      

 
spacer

• View the DATABASE results for 'T1 Time' (15).Open this link in a new window

 
Further Reading:
  Basics:
IMAGE CONTRAST IN MRI(.pdf)
   by www.assaftal.com    
A practical guideline for T1 reconstruction from various flip angles in MRI
Saturday, 1 October 2016   by journals.sagepub.com    
Magnetic resonance imaging - From Wikipedia, the free encyclopedia.
   by en.wikipedia.org    
  News & More:
New technique could allow for safer, more accurate heart scans
Thursday, 10 December 2015   by www.gizmag.com    
Rockland Technimed: Tissue Viability Imaging
Saturday, 15 December 2007   by www.onemedplace.com    
MRI Resources 
Examinations - Colonography - Education pool - Absorption and Emission - Pregnancy - Jobs
 
T1 Relaxation
 
The return to equilibrium (high energy protons returns to the low energy state) within the lattice is named the T1, spin lattice or longitudinal relaxation. During the time T1, the spinning protons realign with the external magnetic field with an exchange of their energy, resulting in heat. The value of the T1 time depends of the tissues ability for energy exchange. See also Longitudinal Relaxation Time.
spacer

• View the DATABASE results for 'T1 Relaxation' (18).Open this link in a new window

 
Further Reading:
  Basics:
Musculoskeletal MRI at 3.0 T: Relaxation Times and Image Contrast
Sunday, 1 August 2004   by www.ajronline.org    
  News & More:
MRI's inside story
Thursday, 4 December 2003   by www.economist.com    
MRI Resources 
MRI Reimbursement - Brain MRI - Colonography - Homepages - Health - Shoulder MRI
 
     1 - 5 (of 21)     next
Result Pages : [1]  [2]  [3 4 5]
 Random Page
 
Share This Page
FacebookTwitterLinkedIn

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



In 2020 your scanner will probably work with a field strength of :
lower 
1T 
1.5T 
2T 
3T 
7T 
higher 

Look
      Ups





MR-TIP.com uses cookies! By browsing MR-TIP.com, you agree to our use of cookies.

Magnetic Resonance - Technology Information Portal
Member of SoftWays' Medical Imaging Group - MR-TIP • Radiology-TIP • US-TIP • 
Copyright © 2003 - 2018 SoftWays. All rights reserved. [ 23 March 2019]
Terms of Use | Privacy Policy | Advertising
 [last update: 2018-03-08 05:11:00]