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Single-shot GRASE imaging with short effective TEs

✍ Scribed by Glyn Johnson; David A. Feinberg; Viswanathan Venkataraman

Book ID
102904485
Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
563 KB
Volume
6
Category
Article
ISSN
1053-1807

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✦ Synopsis

Abstract

A new phase‐encoding scheme for gradient‐ and spin‐echo (GRASE) imaging giving a short effective TE is described. Unlike previous orders, phase encoding is centric rather than sequential. The sequence is a development of k‐banded GRASE that uses different time segments of the echo train to encode different bands of k space. This phase‐encoding order has been implemented in single‐shot sequences on an imager with high performance gradients. Approximately 144 phase‐encoding lines can be acquired in an echo train time of 390 ms. With centric phase encoding, the effective TE is 8 ms, compared with 75 ms for sequential encoding, and signal‐to‐noise ratios (SNRs) in brain tissue are 50 to 70% higher. The sequence can be employed in, for example, diffusion and velocity imaging.

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