Motion correction properties of the shells k-space trajectory

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The feasibility of a k-space trajectory that samples data on a set of 3D shells is demonstrated with phantom and volunteer experiments. Details of an interleaved multi-shot, helical spiral pulse sequence and a gridding reconstruction algorithm that uses Voronoi diagrams are provided. The motion-correction properties of the shells k-space trajectory are described. It is shown that when used in conjunction with three point markers, k-space data acquired with the shells trajectory provide a generalization of the RINGLET method, allowing for correction of arbitrary rigid-body motion with six degrees of freedom. Use of dedicated navigator echoes or redundant acquisitions of k-space data are not required. Retrospective motion correction is demonstrated with controlled phantom experiments and with seven healthy human volunteers. The motion correction is shown to improve the images, both qualitatively and quantitatively with a metric calculated from image entropy. Advantages and challenges of the shells trajectory are discussed, with particular attention to acquisition efficiency.

Original languageEnglish (US)
Pages (from-to)739-749
Number of pages11
JournalMagnetic Resonance Imaging
Volume24
Issue number6
DOIs
StatePublished - Jul 2006

Fingerprint

Trajectories
trajectories
acquisition
Voronoi diagrams
navigators
Entropy
rigid structures
markers
shot
Volunteers
echoes
Healthy Volunteers
degrees of freedom
Experiments
entropy
pulses

Keywords

  • 3D
  • Motion correction
  • RINGLET
  • Shell

ASJC Scopus subject areas

  • Biophysics
  • Clinical Biochemistry
  • Structural Biology
  • Radiology Nuclear Medicine and imaging
  • Condensed Matter Physics

Cite this

Motion correction properties of the shells k-space trajectory. / Shu, Yunhong; Elliott, Andrew M.; Riederer, Stephen J; Bernstein, Matthew A.

In: Magnetic Resonance Imaging, Vol. 24, No. 6, 07.2006, p. 739-749.

Research output: Contribution to journalArticle

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