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A new T2 preparation technique for ultrafast gradient-echo sequence

✍ Scribed by Todd Parrish; Xiaoping Hu

Publisher
John Wiley and Sons
Year
1994
Tongue
English
Weight
586 KB
Volume
32
Category
Article
ISSN
0740-3194

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✦ Synopsis

Abstract

The T~2~, contrast in images obtained with driven equilibrium (90°~x~−180°~x~−90°~x~) prepared ultrafast gradient‐echo sequences is compromised by the longitudinal magnetization build‐up after the second 90°~x~ pulse, which does not carry T~2~ information. This paper describes a new T~2~ contrast preparation technique for ultrafast gradient‐echo sequence that suppresses the signal arising from the build‐up. By dephasing in the preparation and rephasing in the acquisition of the gradient echoes, the new technique eliminates signals that are not dictated by the T~2~ contrast in a driven‐equilibrium approach. Consequently, it generates an image that is essentially T~2~‐weighted. Phantom and in vivo experiments were conducted to validate the technique and to demonstrate its clinical utility. These studies indicate that the technique works properly and can be used for in vivo studies.

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