Motion artifact reduction and vessel enhancement for free-breathing navigator-gated coronary MRA using 3D k-space reordering

Michael E. Huber, David Hengesbach, René M. Botnar, Kraig V. Kissinger, Peter Boesiger, Warren J. Manning, Matthias Stuber

Research output: Contribution to journalArticlepeer-review

Abstract

Breathing-induced bulk motion of the myocardium during data acquisition may cause severe image artifacts in coronary magnetic resonance angiography (MRA). Current motion compensation strategies include breath-holding or free-breathing MR navigator gating and tracking techniques. Navigator-based techniques have been further refined by the applications of sophisticated 2D k-space reordering techniques. A further improvement in image quality and a reduction of relative scanning duration may be expected from a 3D k-space reordering scheme. Therefore, a 3D k-space reordered acquisition scheme including a 3D navigator gated and corrected segmented k-space gradient echo imaging sequence for coronary MRA was implemented. This new zonal motion-adapted acquisition and reordering technique (ZMART) was developed on the basis of a numerical simulation of the Bloch equations. The technique was implemented on a commercial 1.5T MR system, and first phantom and in vivo experiments were performed. Consistent with the results of the theoretical findings, the results obtained in the phantom studies demonstrate a significant reduction of motion artifacts when compared to conventional (non-k-space reordered) gating techniques. Preliminary in vivo findings also compare favorably with the phantom experiments and theoretical considerations.

Original languageEnglish (US)
Pages (from-to)645-652
Number of pages8
JournalMagnetic resonance in medicine
Volume45
Issue number4
DOIs
StatePublished - 2001

Keywords

  • Coronary MRA
  • K-space reordering
  • Motion adapted gating
  • RF excitation angle calculation
  • ZMART

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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