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Ramping
 
Changing the strength of the magnetic field of a magnet. See Ramp Time.
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Random ArtifactInfoSheet: - Artifacts -
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A signal to noise improvement method that is accomplished by taking the average of several FID's made under similar conditions to suppress the effects of random variations or random artifacts.
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Random Noise
 
Noise whose amplitude follows some probability distribution and is uncorrelated.
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Rapid Acquisition Matrix FASTInfoSheet: - Sequences -
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(RAM-FAST) A fast gradient echo pulse sequence using a magnetization preparation pulse.

See Ultrafast Gradient Echo Sequence.
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Rapid Acquisition with Refocused EchoesInfoSheet: - Sequences -
Intro, Overview, 
Types of, 
etc.MRI Resource Directory:
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(RARE) If the image lines from multiple echoes are used for the same image, this results in the RARE pulse sequence. The sequence is similar to fast spin echo.

See Fast Spin Echo.
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Further Reading:
  Basics:
RARE
Monday, 3 December 2012   by www2.warwick.ac.uk    
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New acceleration techniques will :
reduce scan times 
cause artifacts 
increase expenses 
be useful if you have a lot of experience 
doesn't do much 
never heard of 

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