Magnetic Resonance - Technology Information Portal Welcome to MRI Technology


 'Dipole Dipole Interaction' 
  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 'Dipole Dipole Interaction' found in 1 term [] and 2 definitions [], (+ 1 Boolean[] results
1 - 4 (of 4)     
Result Pages : [1]
MRI Resources 
Safety pool - MRI Reimbursement - Diffusion Weighted Imaging - Jobs pool - MRCP - Nerve Stimulator
Dipole Dipole Interaction
Interaction between a spin and its neighbors due to their magnetic dipole moments. This is an important mechanism contributing to relaxation rates. In solids and viscous liquids this can result in broadening of the spectral lines.
• Share the entry 'Dipole Dipole Interaction':  Facebook  Twitter  LinkedIn  
Further Reading:
MRI Resources 
Pacemaker - Mobile MRI - Image Quality - Quality Advice - Diffusion Weighted Imaging - MRCP
Gadopentetate DimeglumineInfoSheet: - Contrast Agents - 
Intro, Overview, 
Types of, 
etc.MRI Resource Directory:
 - Contrast Agents -
Short name: Gd-DTPA, generic name: Gadopentetate dimeglumine, chemical compound: Gadolinium-diethylenetriaminepentaacetic acid
Gadopentetate dimeglumine was introduced in 1981, as the first paramagnetic MRI contrast agent (ionic). The Gd-induced dipole dipole interactions lead to shortening of T1, which results in contrast enhancement on T1 weighted images. The used metal ion Gd3+ (gadolinium) is toxic, and therefore bound in the renally excreted DTPA chelate, a very stable complex. The Gd-complex also induce susceptibility effects, as a result of the magnetic field gradient between the contrast agent in the blood vessels and the surrounding tissue, that lead to shortening of T2 or T2*.
Following intravenous administration, the compound is distributed rapidly in the extracellular space and is eliminated unchanged by glomerular filtration via the kidneys. Up to 6 hours, post injection an average of 83% of the dose is eliminated renal.
See also Magnevist®, Gadolinium and Contrast Agents.


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

Further Reading:
Magnevist Package Insert
Gadopentetic acid
MRI Resources 
Non-English - Pregnancy - Chemistry - Stent - Societies - Mass Spectrometry
Isotropic Motion
Motion, which is uniform in all directions. This is generally used in reference to molecular diffusion or rotation, which gives rise to relaxation of the spin system through the dipole dipole interaction.
MRI Resources 
Breast MRI - Contrast Agents - Non-English - Diffusion Weighted Imaging - Pediatric and Fetal MRI - Hospitals
Paramagnetic materials attract and repel like normal magnets when subject to a magnetic field. This alignment of the atomic dipoles with the magnetic field tends to strengthen it, and is described by a relative magnetic permeability greater than unity. Paramagnetism requires that the atoms individually have permanent dipole moments even without an applied field, which typically implies a partially filled electron shell. In pure Paramagnetism (without an external magnetic field), these atomic dipoles do not interact with one another and are randomly oriented in the absence of an external field, resulting in zero net moment.
Paramagnetic materials in magnetic fields will act like magnets but when the field is removed, thermal motion will quickly disrupt the magnetic alignment. In general, paramagnetic effects are small (magnetic susceptibility of the order of 10-3 to 10-5).
In MRI, gadolinium (Gd) one of these paramagnetic materials is used as a contrast agent. Through interactions between the electron spins of the paramagnetic gadolinium and the water nuclei nearby, the relaxation rates (T1 and T2) of the water protons are increased (T1 and T2 times are decreased), causing an increase in signal on T1 weighted images.
See also contrast agents, magnetism, ferromagnetism, superparamagnetism, and diamagnetism.

• View the DATABASE results for 'Paramagnetism' (11).Open this link in a new window

Further Reading:
Magnet basics
Wednesday, 23 November 2005   by    
  News & More:
2003   by    
MRI Resources 
Education pool - MR Myelography - Jobs pool - Stimulator pool - MR Guided Interventions - Software
     1 - 4 (of 4)     
Result Pages : [1]
 Random Page
Share This Page

Forgot your UserID/Password ?  

Your MRI scanner(s) in 5 years should be :
more automated 
much quicker 
voice controlled 
iPhone compatible 
as it is right now 


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]