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 'Coupling' 
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Coupling
 
See Spin Spin Coupling.
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Further Reading:
  Basics:
A Half-Volume Coil for Efficient Proton Decoupling in Humans at 4 Tesla
1997   by www.cmrr.umn.edu    
Game-Changing Nanodiamond Discovery for MRI
Sunday, 17 January 2010   by www.sciencedaily.com    
RF Coils in MRI
Sunday, 1 January 2006   by ric.uthscsa.edu    
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DecouplingInfoSheet: - Artifacts - 
Case Studies, 
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1) The specific irradiation designed to remove the multiple structure in a particular resonance due to spin spin coupling with other nuclei;
2) The preventing of the interaction by mutual inductive coupling of two (or more) resonant RF coils, e.g. by detuning coils not in use at a particular point in time. Decoupling can take the form of active decoupling where an externally controlled switching circuit is used to detune the non-selected coils or passive decoupling where RF energy from the transmitter pulse is used to switch diodes to detune the appropriate coil.
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Further Reading:
  Basics:
A Half-Volume Coil for Efficient Proton Decoupling in Humans at 4 Tesla
1997   by www.cmrr.umn.edu    
Tech Spotlight: How to calibrate an MRI RF amplifier
Saturday, 1 December 2012   by medicaldesign.com    
MRI Resources 
Anatomy - Pathology - Homepages - Breast Implant - Cardiovascular Imaging - DICOM
 
Coupling Constant
 
Spectral lines are split by spin spin coupling into multiplets whose frequencies are separated by an amount depending on the coupling constant, J. The magnitude of J is independent of the strength of the applied magnetic field and is given in units of frequency, Hz.

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Further Reading:
  Basics:
Tech Spotlight: How to calibrate an MRI RF amplifier
Saturday, 1 December 2012   by medicaldesign.com    
  News & More:
Spin Spin Coupling:The splitting of NMR Signals
   by iis.dmhcsm.edu.hk    
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Spin Spin Coupling
 
NMR spectral lines may consist of groups of lines called multiplets. This multiplet structure is caused by interactions between nuclei that split the NMR energy levels and result in the observation of multiple allowed transitions separated by an amount of energy related to J, the spin spin coupling constant. These interactions are called spin spin coupling.
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Further Reading:
  Basics:
Spin Spin Coupling:The splitting of NMR Signals
   by iis.dmhcsm.edu.hk    
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Magic Angle Effect (Artifact)InfoSheet: - Artifacts - 
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Quick Overview

Artifact Information
NAME Magic angle
DESCRIPTION Increase of the T2 time, bright signal in tendons
REASON Angle about 55° to the main magnetic field
HELP Angle not about 55°

The magic angle is a precisely defined angle, the value is approximately 54.7°. Hence, two nuclei with a dipolar coupling vector at an angle of approximately 54.7° to a strong external magnetic field have zero dipolar coupling.
Magic angle spinning is a technique in solid-state NMR spectroscopy, which employs this principle to remove or reduce dipolar couplings, thereby increasing spectral resolution. In MRI, the magic angle effect visualizes as bright spots through an increased T2 time on short echo time (TE) images, for e.g. collagen fibers of tendons and ligaments, which are oriented at the magic angle of approximately 54.7° to the magnetic field.


Image Guidance
Take care that tendons and ligaments are not oriented at about a 54.7° angle to the main magnetic field.
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Further Reading:
  Basics:
Magic angle
   by en.wikipedia.org    
Magic Angle Effects
   by www.mritutor.org    
MRI Resources 
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