Single-shot 3D GRASE with cylindrical k-space trajectories

Sudhir Ramanna, D. A. Feinberg

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Development of GRASE (gradient- and spin-echo) pulse sequences for single-shot 3D imaging has been motivated by physiologic studies of the brain. The duration of echo-planar imaging (EPI) subsequences between RF refocusing pulses in the GRASE sequence is determinant of image distortions and susceptibility artifacts. To reduce these artifacts the regular Cartesian trajectory is modified to a circular trajectory in 2D and a cylindrical trajectory in 3D for reduced echo train time. Incorporation of "fly-back" trajectories lengthened the time of the subsequences and proportionally increased susceptibility artifact but the unipolar readout gradients eliminate all ghost artifacts. The modified cylindrical trajectory reduced susceptibility artifact and distortion artifact while raising the signal-to-noise ratio in both phantom and human brain images.

Original languageEnglish (US)
Pages (from-to)976-980
Number of pages5
JournalMagnetic resonance in medicine
Issue number4
StatePublished - Oct 2008


  • Circular
  • Cylindrical
  • EPI
  • K-space trajectory


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