T2*
Definition: The effective T2 relaxation time, shorter than T2 because of magnetic field inhomogeneities; the observed time constant of free induction decay. In gradient echo images, contrast depends on T2*, whereas in sequences with a 180° rephasing pulse, the contrast depends on T2.
[tē-tū′stăr]
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Examples: glitazone, GI cocktail, etc.
