Premium
Water and fat separation in real‐time MRI of joint movement with phase‐sensitive bSSFP
Author(s) -
Mazzoli Valentina,
Nederveen Aart J.,
Oudeman Jos,
Sprengers Andre,
Nicolay Klaas,
Strijkers Gustav J.,
Verdonschot Nico
Publication year - 2017
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.26341
Subject(s) - magnetic resonance imaging , computer science , visualization , computer vision , artificial intelligence , real time mri , image quality , wrist , biomedical engineering , joint (building) , sequence (biology) , separation (statistics) , pixel , phase (matter) , knee joint , signal to noise ratio (imaging) , image (mathematics) , medicine , physics , radiology , chemistry , surgery , telecommunications , architectural engineering , biochemistry , quantum mechanics , machine learning , engineering
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. © 2016 International Society for Magnetic Resonance in Medicine