Abstract
Objectives
Chemical Shift Encoded Magnetic Resonance Imaging (CSE-MRI)-based quantification of low-level (< 5% of proton density fat fraction—PDFF) fat infiltration requires highly accurate data reconstruction for the assessment of hepatic or pancreatic fat accumulation in diagnostics and biomedical research.
Materials and methods
We compare three software tools available for water/fat image reconstruction and PDFF quantification with MRS as the reference method. Based on the algorithm exploited in the tested software, the accuracy of fat fraction quantification varies. We evaluate them in phantom and in vivo MRS and MRI measurements.
Results
The signal model of Intralipid 20% emulsion used for phantoms was established for 3 T and 9.4 T fields. In all cases, we noticed a high coefficient of determination (R-squared) between MRS and MRI–PDFF measurements: in phantoms <0.9924–0.9990>; and in vivo <0.8069–0.9552>. Bland–Altman analysis was applied to phantom and in vivo measurements.
Discussion
Multi-echo MRI in combination with an advanced algorithm including multi-peak spectrum modeling appears as a valuable and accurate method for low-level PDFF quantification over large FOV in high resolution, and is much faster than MRS methods. The graph-cut algorithm (GC) showed the fewest water/fat swaps in the PDFF maps, and hence stands out as the most robust method of those tested.
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Acknowledgements
This work was partially supported by the European Commission and Ministry of Education, Youth, and Sports (projects No. CZ.1.05/2.1.00/01.0017, LO1212; No. 7AMB18AT023; 8J18AT023; AKTION AUT-CZE # 74p6), the Czech Academy of Sciences (project No. MSM100651801), Austrian Federal Ministry of Education, Science and Research; Contract grant number: BMWFW WTZ Mobility, CZ09-2019.
Funding
This study was funded by the European Commission and Ministry of Education, Youth, and Sports (projects No. CZ.1.05/2.1.00/01.0017, LO1212; No. 7AMB18AT023; 8J18AT023; AKTION AUT-CZE # 74p6), the Czech Academy of Sciences (project No. MSM100651801).
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RK: study conception and design, acquisition of data, analysis and interpretation of data, drafting of manuscript. MG: critical revision. ST: critical revision. ZS jr.: critical revision, drafting of manuscript. MK: study conception and design, drafting of manuscript.
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Author Radim Kořínek declares that he has no conflict of interest. Author Martin Gajdošík declares that he has no conflict of interest. Author Martin Gajdošík declares that he has no conflict of interest. Author Siegfried Trattnig declares that he has no conflict of interest. Author Zenon Starčuk jr. declares that he has no conflict of interest. Author Martin Krššák declares that he has no conflict of interest.
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Kořínek, R., Gajdošík, M., Trattnig, S. et al. Low-level fat fraction quantification at 3 T: comparative study of different tools for water–fat reconstruction and MR spectroscopy. Magn Reson Mater Phy 33, 455–468 (2020). https://doi.org/10.1007/s10334-020-00825-9
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DOI: https://doi.org/10.1007/s10334-020-00825-9