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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.

[te-tu'star]

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.

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