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 'SHORT Repetition Technique Based on Free Induction Decay' 
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SHORT Repetition Technique Based on Free Induction DecayInfoSheet: - Sequences - 
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 - Sequences -
 
(F-SHORT) A gradient echo sequence.

See Coherent Gradient Echo and Refocused Gradient Echo Sequence.
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Refocused Gradient Echo SequenceInfoSheet: - Sequences - 
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Refocused GRE sequences use a refocusing gradient in the phase encoding direction during the end module to maximize (refocus) remaining xy- (transverse) magnetization at the time when the next excitation is due, while the other two gradients are, in any case, balanced.
When the next excitation pulse is sent into the system with an opposed phase, it tilts the magnetization in the α direction. As a result the z-magnetization is again partly tilted into the xy-plane, while the remaining xy-magnetization is tilted partly into the z-direction.
Companies use different acronyms to describe certain techniques.

Different terms for these gradient echo pulse sequences
R-GRE Refocused Gradient Echo,
FAST Fourier Acquired Steady State,
FFE Fast Field echo,
FISP Fast Imaging with Steady State Precession,
F-SHORT SHORT Repetition Technique Based on Free Induction Decay,
GFEC Gradient Field Echo with Contrast,
GRASS Gradient Recalled Acquisition in Steady State,
ROAST Resonant Offset Averaging in the Steady State,
SSFP Steady State Free Precession.
STERF Steady State Technique with Refocused FID

In this context, 'contrast' refers to the pulse sequence, it does not mean enhancement with a contrast agent.
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MRI is trending to low field magnets :
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