Dixon water-fat separation in PROPELLER MRI acquired with two interleaved echoes

Michael Schär, Holger Eggers, Nicholas R. Zwart, Yuchou Chang, Akshay Bakhru, James G. Pipe

Research output: Contribution to journalArticle

Abstract

Purpose To propose a novel combination of robust Dixon fat suppression and motion insensitive PROPELLER (periodically rotated overlapping parallel lines with enhanced reconstruction) MRI. Methods Two different echoes were acquired interleaved in each shot enabling water-fat separation on individual blades. Fat, which was blurred in standard PROPELLER because the water-fat shift (WFS) rotated with the blades, was shifted back in each blade. Additionally, field maps obtained from the water-fat separation were used to unwarp off-resonance-induced shifts in each blade. PROPELLER was then applied to the water, corrected fat, or recombined water-fat blades. This approach was compared quantitatively in volunteers with regard to motion estimation and signal-to-noise ratio (SNR) to a standard PROPELLER acquisition with minimal WFS and fat suppression. Results Shifting the fat back in each blade reduced errors in the translation correction. SNR in the proposed Dixon PROPELLER was 21% higher compared with standard PROPELLER with identical scan time. High image quality was achieved even when the volunteers were moving during data acquisition. Furthermore, sharp water-fat borders and image details were seen in areas where standard PROPELLER suffered from blurring when acquired with a low readout bandwidth. Conclusion The proposed method enables motion-insensitive PROPELLER MRI with robust fat suppression and reduced blurring. Additionally, fat images are available if desired.

Original languageEnglish (US)
Pages (from-to)718-728
Number of pages11
JournalMagnetic resonance in medicine
Volume75
Issue number2
DOIs
StatePublished - Feb 1 2016

Keywords

  • Dixon
  • PROPELLER
  • fat suppression
  • motion correction
  • off-resonance correction
  • water-fat separation

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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