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Single‐shot GRASE imaging with short effective TEs
Author(s) -
Johnson Glyn,
Feinberg David A.,
Venkataraman Viswanathan
Publication year - 1996
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.1880060617
Subject(s) - shot (pellet) , single shot , computer science , medical physics , nuclear medicine , medicine , materials science , physics , optics , metallurgy
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.