Single-shot GRASE imaging with short effective TEs

G. Johnson, D. A. Feinberg, V. Venkataraman

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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.
Original languageEnglish
Pages (from-to)944-947
JournalJournal of Magnetic Resonance Imaging
Issue number6
Publication statusPublished - 1996


  • Rapid imaging
  • Functional imaging

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