Water and fat separation in real-time MRI of joint movement with phase-sensitive bSSFP

Valentina Mazzoli*, Aart J. Nederveen, Jos Oudeman, Andre Sprengers, Klaas Nicolay, Gustav J. Strijkers, Nico Verdonschot

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)

Abstract

Purpose: To introduce a method for obtaining fat-suppressed images in real-time MRI of moving joints at 3 Tesla (T) using a bSSFP sequence with phase detection to enhance visualization of soft tissue structures during motion. Methods: The wrist and knee of nine volunteers were imaged with a real-time bSSFP sequence while performing dynamic tasks. For appropriate choice of sequence timing parameters, water and fat pixels showed an out-of-phase behavior, which was exploited to reconstruct water and fat images. Additionally, a 2-point Dixon sequence was used for dynamic imaging of the joints, and resulting water and fat images were compared with our proposed method. Results: The joints could be visualized with good water–fat separation and signal-to-noise ratio (SNR), while maintaining a relatively high temporal resolution (5 fps in knee imaging and 10 fps in wrist imaging). The proposed method produced images of moving joints with higher SNR and higher image quality when compared with the Dixon method. Conclusions: Water–fat separation is feasible in real-time MRI of moving knee and wrist at 3 T. PS-bSSFP offers movies with higher SNR and higher diagnostic quality when compared with Dixon scans. Magn Reson Med 78:58–68, 2017.

Original languageEnglish
Pages (from-to)58-68
Number of pages11
JournalMagnetic resonance in medicine
Volume78
Issue number1
DOIs
Publication statusPublished - 1 Jul 2017

Keywords

  • bSSFP
  • knee MRI
  • real-time MRI
  • water-fat separation
  • wrist MRI

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    Mazzoli, V., Nederveen, A. J., Oudeman, J., Sprengers, A., Nicolay, K., Strijkers, G. J., & Verdonschot, N. (2017). Water and fat separation in real-time MRI of joint movement with phase-sensitive bSSFP. Magnetic resonance in medicine, 78(1), 58-68. https://doi.org/10.1002/mrm.26341