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


Out-
      side
 



 
 'Correlation Time' 
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 'Correlation Time' found in 1 term [] and 1 definition [], (+ 1 Boolean[] results
1 - 3 (of 3)     
Result Pages : [1]
Searchterm 'Correlation Time' was also found in the following service: 
spacer
Resources  (1)  
 
Correlation Time
 
The characteristic time between significant fluctuations in the local magnetic field experienced by a spin due to molecular motions. For values of the correlation time such that the magnetic field as a function of time has large Fourier components near the resonance frequency, the T1 relaxation time will be shortened.
spacer
 
• Share the entry 'Correlation Time':  Facebook  Twitter  LinkedIn  
MRI Resources 
Nerve Stimulator - Contrast Agents - RIS - Safety pool - Cardiovascular Imaging - Societies
 
Relaxivity
 
The ability of magnetic compounds to increase the relaxation rates of the surrounding water proton spins.
Relaxivity is used to improve the contrast of the image, and to study tissue specific areas where the contrast agent better diffuses or to perform functional magnetic resonance imaging.
The relaxivity of MRI contrast agents depends on the molecular structure and kinetic of the complex. To increase the number of water molecules that are in the inner sphere of the complex, or to slow down the molecular rotational correlation time, are possibilities to improve the water relaxivity.
Relaxivity units ( r1, r2 ) are mM-1 * sec-1 (at varying temperatures).
spacer

• View the DATABASE results for 'Relaxivity' (51).Open this link in a new window


• View the NEWS results for 'Relaxivity' (2).Open this link in a new window.
 
Further Reading:
  News & More:
Measurements of the relaxivity of gadolinium chelates in tissues in vivo(.pdf)
2001   by cds.ismrm.org    
MRI Resources 
Distributors - Implant and Prosthesis - Claustrophobia - DICOM - MRI Technician and Technologist Schools - Shoulder MRI
 
Audio Frequency ArtifactInfoSheet: - Artifacts - 
Case Studies, 
Reduction Index, 
etc.MRI Resource Directory:
 - Artifacts -
 
Quick Overview

Artifact Information
NAME Audio frequency
DESCRIPTION Ghosting, lines or spots
REASON Wrong modulation at audio rate, wrong audio signal
HELP AC-line synchronization

Two types of audio-frequency problems are possible:

1. Modulation of the MR signal at an audio rate 2. Audio signal component at digitizer input
Problem 1 looks like ghosts, weak copies of the real image, displaced along the phase encoding direction. The number and intensity of the ghosts depends upon the relationship between the period of the audio modulation and the repetition time.
Problem 2 shows up as lines or spots at the appropriate points along the frequency direction. If there is no correlation between the audio period and TR, lines are generated or discrete spots occur.


Image Guidance
Both problems can be lessened by use of AC-line synchronization (line trigger).

spacer
Searchterm 'Correlation Time' was also found in the following service: 
spacer
Resources  (1)  
 
     1 - 3 (of 3)     
Result Pages : [1]
 Random Page
 
Share This Page
FacebookTwitterLinkedIn

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



The impact of TTIP/TPP on the MRI scanner market will bring :
more variety 
better scanners 
more risk 
less regulation 
cheaper scanners 
Lost in Translation 
no change at all 

Look
      Ups





Magnetic Resonance - Technology Information Portal
Member of SoftWays' Medical Imaging Group - MR-TIP • Radiology-TIP • US-TIP • The-Medical-Market
Copyright © 2003 - 2016 SoftWays. All rights reserved. [ 24 February 2017]
Terms of Use | Privacy Policy | Advertising
 [last update: 2017-02-21 00:45:00]