General MRI Acronym Definitions

Spectroscopy Acronym Directory  General MRI Acronym Directory

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Acronym	MAST
Expansion	Motion Artifact Suppression Technique
Explanation	Method whereby spins that are moving at a constant velocity along a gradient are rephased by virtue of a reversed or inverted gradient pattern. The resultant waveform results in every second gradient echo being rephased, or "flow-compensated"
Synonyms	GMN, FC, FEER
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Date Entered	4/28/98

Acronym	MIP
Expansion	Maximum Intensity Projection
Explanation MIP diagram	MRA post-processing technique used to display results of TOF or PC sequences. Algorithm involves selecting largest value (maximum intensity) along a set of imaginary viewing angles through the imaging volume. See
Synonyms
Related Terms	MRA, MOTSA, TOF, PC, VOI
Reference
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Date Entered	4/28/98

Acronym	MOTSA
Expansion	Multiple Overlapping Thin Slab Angiography
Explanation (Diagram)	In 3D TOF imaging, slowly flowing blood can become saturated and produce signal drop-out, and this increases with slab volume. MOTSA technique uses series of overlapping thin slabs to combat this problem. However, saturation within the combined thin slabs produces "Venetian blind" artifact. Another method is to use a ramped RF pulse that produces a higher flip angle across a slab, so that all spins experience a more constant flip angle.
Synonyms
Related Terms	MRA, TOF, MTC
Reference
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Date Entered	4/28/98

Acronym	MRA
Expansion	Magnetic Resonance Angiography
Explanation	Using magnetic resonance techniques to produce angiographic images. Can be performed without (usually) or with contrast. TOF techniques utilize flow-related enhancement whereas PC techniques utilize phase accumulation along a gradient.
Synonyms
Related Terms	TOF, PC, MOTSA
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Acronym	MTC
Expansion	Magnetization Transfer Contrast
Explanation (Diagram)	Method of suppressing signal from tissues with high protein content (brain,muscle) by applying a saturation pulse far (-1500 Hz) from the resonance frequency of water, which saturates protons bound to macromolecules (proteins), as well as nearby water (magnetization transfer).
Synonyms
Related Terms	MRA, Gd
Reference	SMRM 9, 352
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Acronym	NEX
Expansion	Number of Excitations
Explanation	Number of RF excitations performed on a particular slice. Synonymous with NSA.
Synonyms	NSA
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Acronym	NSA
Expansion	Number of Signal Averages
Explanation	Number of NMR signals average together to arrive at a final value for each signal location. Signal to noise and scan time both increase with increasing number of signal averages.
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