Prospective motion correction and selective reacquisition using volumetric navigators for vessel-encoded arterial spin labeling dynamic angiography

Robert Frost, Aaron T. Hess, Thomas W. Okell, Michael A. Chappell, M. Dylan Tisdall, André J.W. van der Kouwe, Peter Jezzard

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Purpose: The aim of this study was to improve robustness to motion in a vessel-encoded angiography sequence used for patient scans. The sequence is particularly sensitive to motion between imaging segments, which causes ghosting and blurring that propagates to the final angiogram. Methods: Volumetric echo planar imaging (EPI) navigators acquired in 275 ms were inserted after the imaging readout in a vessel-encoded pseudo-continuous arterial spin labeling (VEPCASL) sequence. The effects of movement between segments on the images were tested with phantom experiments. Deliberate motion experiments with healthy volunteers were performed to compare prospective motion correction (PMC) with reacquisition versus no correction. Results: In scans without motion, the addition of the EPI navigator to the sequence did not affect the quality of the angiograms in comparison with the original sequence. PMC and reacquisition improved the visibility of vessels in the angiograms compared with the scans without correction. The reacquisition strategy was shown to be important for complete correction of imaging artifacts. Conclusion: We have demonstrated an effective method to correct motion in vessel-encoded angiography. For reacquisition of 15 segments, the technique requires approximately 30 s of additional scanning (∼25%). Magn Reson Med 76:1420–1430, 2016.

Original languageEnglish
Pages (from-to)1420-1430
Number of pages11
JournalMagnetic Resonance in Medicine
Volume76
Issue number5
DOIs
StatePublished - Nov 1 2016
Externally publishedYes

Keywords

  • magnetic resonance angiography
  • prospective motion correction
  • pseudo-continuous arterial spin labeling
  • reacquisition
  • vessel-encoded angiography
  • volumetric navigator

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