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Driven Equilibrium Fast Spin EchoInfoSheet: - Sequences - 
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(DE FSE) A fast spin echo sequence with application of a pulse, which sensitizes the sequence to variations in T2.
 
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Metal Artefact Reduction
Thursday, 9 June 2011   by www.revisemri.com    
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Gradient Field Echo with ContrastInfoSheet: - Sequences - 
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Multi Echo Data Image CombinationInfoSheet: - Sequences - 
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(MEDIC) MEDIC is a heavily T2* weighted spoiled gradient echo sequence with multiple echoes. MEDIC uses a series of identically phase encoded gradient echoes, sampled per line in k-space. Unipolar frequency encoding gradients are used to achieve flow compensation and to avoid off resonance effects. For each echo the magnitude images are reconstructed and postprocessed by using a sum of squares algorithm to improve the signal to noise ratio. The increased receiver bandwidth reduces the T2* effects and impairment of the spatial resolution.
The multi echo data image combination sequence is potentially useful in imaging of cartilage in joints.
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Volume Excitation Stimulated Echoes
 
(VEST) The 'Volume Excitation Stimulated Echoes' sequence is a method similar to point resolved spectroscopy with stimulated echoes and volume selective excitation.
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Incoherent Gradient Echo (RF Spoiled)InfoSheet: - Sequences - 
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A gradient echo is generated by using a pair of bipolar gradient pulses. The gradient field is negatively pulsed, causing the spins of the xy-magnetization to dephase. A second gradient pulse is applied with the opposite polarity. During the pulsing, the spins that dephased begin to rephase and generate a gradient echo.
Spoiling can be accomplished by RF or a gradient. The incoherent RF spoiled type of a gradient echo sequence use a continuous shifting of the RF pulse to spoil the residual transverse magnetization. The phase of the RF excitation and receiver channel are varied pseudo randomly with each excitation cycle to prevent the xy magnetization from achieving steady state. T2* does not dominate image contrast, so T1 and PD weighting is practical. This method is effective and can be used to achieve a shorter TR, due to a lack of additional gradients. Spoiling eliminates the effect of the remaining xy-magnetization and leads to steady state longitudinal magnetization. These sequences can be used for breath hold, dynamic imaging and in cine and volume acquisitions.
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