Reduction of flow- and eddy-currents-induced image artifacts in coronary magnetic resonance angiography using a linear centric-encoding SSFP sequence

Xiaoming Bi, Jaeseok Park, Vibhas Deshpande, Orlando Simonetti, Gerhard Laub, Debiao Li

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Coronary magnetic resonance angiography (MRA) acquired using steady-state free precession (SSFP) sequences tends to suffer from image artifacts caused by local magnetic field inhomogeneities. Flow- and gradient-switching-induced eddy currents are important sources of such phase errors, especially under off-resonant conditions. In this study, we propose to reduce these image artifacts by using a linear centric-encoding (LCE) scheme in the phase-encoding (PE) direction. Abrupt change in gradients, including magnitude and polarity between consecutive radiofrequency cycles, is minimized using the LCE scheme. Results from numeric simulations and phantom studies demonstrated that signal oscillation can be markedly reduced using LCE as compared to conventional alternating centric-encoding (ACE) scheme. The image quality of coronary arteries was improved at both 1.5 and 3.0 T using LCE compared to those acquired using ACE PE scheme (1.5 T: ACE/LCE=2.2±0.8/3.0±0.6, P=.02; 3.0 T: ACE/LCE=2.1±1.1/3.0±0.8, P=.01). In conclusion, flow- and eddy-currents-induced imaging artifacts in coronary MRA using SSFP sequence can be markedly reduced with LCE acquisition of PE lines.

Original languageEnglish
Pages (from-to)1138-1147
Number of pages10
JournalMagnetic Resonance Imaging
Volume25
Issue number8
DOIs
Publication statusPublished - 2007 Oct

Keywords

  • Coronary arteries
  • Eddy currents
  • Flow
  • High-field imaging
  • Magnetic resonance angiography (MRA)
  • SSFP

ASJC Scopus subject areas

  • Biophysics
  • Biomedical Engineering
  • Radiology Nuclear Medicine and imaging

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