A method to measure arbitrary k-space trajectories for rapid MR imaging.


Journal Article

A method to measure arbitrary k-space trajectories was developed to compensate for nonideal gradient performance during rapid magnetic resonance (MR) imaging with actively or nonactively shielded gradients at a magnetic field strength of 4.1 T. Accurate MR image reconstruction requires knowledge of the k-trajectory produced by the gradient waveforms during k-space sampling. Even with shielded gradients, residual eddy currents and imperfections in gradient amplifier performance can cause the true k-space trajectory to deviate from the ideal trajectory. The k-space determination was used for spiral gradient-echo imaging fo the human brain. While individual calibrations are needed for new pulse sequences, the method of k-space determination can be used for any sequence of preparation pulses and readout gradient waveforms and should prove useful for other trajectories, including the rastered lines of echo-planar imaging.

Full Text

Duke Authors

Cited Authors

  • Mason, GF; Harshbarger, T; Hetherington, HP; Zhang, Y; Pohost, GM; Twieg, DB

Published Date

  • September 1997

Published In

Volume / Issue

  • 38 / 3

Start / End Page

  • 492 - 496

PubMed ID

  • 9339451

Pubmed Central ID

  • 9339451

International Standard Serial Number (ISSN)

  • 0740-3194

Digital Object Identifier (DOI)

  • 10.1002/mrm.1910380318


  • eng

Conference Location

  • United States