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Frequency Encoding Gradient
 
(Gf) A frequency encoding gradient produces a magnetic gradient field present during MR signal acquisition to encode signals into different frequencies, depending on their position toward the gradient.
Also called readout gradient.
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Further Reading:
  Basics:
Magnetic resonance imaging
   by www.scholarpedia.org    
  News & More:
BIOPAC Systems, Inc. Announces MRI Gradient Artifact Removal Tools for ECG and EMG Data
Tuesday, 10 February 2009   by www.biospace.com    
Improved shim method based on the minimization of the maximum off-resonance frequency for balanced SSFP
Monday, 1 June 2009   by www.ncbi.nlm.nih.gov    
Frequency Offset
 
The difference between given signal frequency and a reference frequency.
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MRI Resources 
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Frequency Selective RF Pulse
 
A RF pulse containing energy only within a specified frequency range. Usually used for slice excitation or for selective saturation pulses.
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Fringe Field
 
The magnetic field outside the magnet, which is also called the stray field. Its strength depends on the magnet type and the field strength. The higher the field strength, the larger the fringe field.

See Magnetic Fringe Field.
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Further Reading:
  Basics:
Physics of MRI Safety
   by www.aapm.org    
Full Width at Half Maximum
 
(FWHM) A commonly used measure of the width at half the maximum value of peaked functions such as spectral lines or slice profiles and important measure of the quality of an imaging device and its spatial resolution. As the name states, the FWHM is measured by identifying the points on the signal curve, which are half the maximum value. The horizontal distance between these two points is called the FWHM. For a spectral line, this will be proportional to 1/T2.
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Further Reading:
  Basics:
Full width at half maximum
   by en.wikipedia.org    
  News & More:
Magnetic resonance-guided motorized transcranial ultrasound system for blood-brain barrier permeabilization along arbitrary trajectories in rodents
Thursday, 24 December 2015   by www.ncbi.nlm.nih.gov    
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MRI is trending to low field magnets :
reduced costs will lead to this change 
AI will close the gap to high field 
only in remote areas 
is only temporary 
never 

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