1. Quantitative susceptibility mapping in combination with water-fat separation for simultaneous liver iron and fat fraction quantification.
- Author
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Lin H, Wei H, He N, Fu C, Cheng S, Shen J, Wang B, Yan X, Liu C, and Yan F
- Subjects
- Adolescent, Adult, Aged, Fatty Liver complications, Feasibility Studies, Female, Humans, Iron Overload complications, Male, Middle Aged, Prospective Studies, ROC Curve, Water, Young Adult, Fatty Liver diagnostic imaging, Fatty Liver metabolism, Iron metabolism, Iron Overload diagnostic imaging, Liver diagnostic imaging, Liver metabolism, Magnetic Resonance Spectroscopy methods
- Abstract
Purposes: To evaluate the feasibility of simultaneous quantification of liver iron concentration (LIC) and fat fraction (FF) using water-fat separation and quantitative susceptibility mapping (QSM)., Methods: Forty-five patients suspected of liver iron overload (LIO) were included. A volumetric interpolated breath-hold examination sequence for QSM and FF, a fat-saturated gradient echo sequence for R
2 * , a spin echo sequence for LIC measurements and MRS analyses for FF (FF-MRS) were performed. Magnetic susceptibility and FF were calculated using a water-fat separation method (FF-MRI). Correlation and receiver operating characteristic analyses were performed., Results: Magnetic susceptibility showed strong correlation with LIC (rs =0.918). The optimal susceptibility cut-off values were 0.34, 0.63, 1.29 and 2.23 ppm corresponding to LIC thresholds of 1.8, 3.2, 7.0 and 15.0 mg/g dry weight. The area under the curve (AUC) were 0.948, 0.970, 1 and 1, respectively. No difference in AUC was found between susceptibility and R2 * at all LIC thresholds. Correlation was found between FF-MRI and FF-MRS (R2 =0.910)., Conclusions: QSM has a high diagnostic performance for LIC quantification, similar to that of R2 * . FF-MRI provides simultaneous fat quantification. Findings suggest QSM in combination with water-fat separation has potential value for evaluating LIO, especially in cases with coexisting steatosis., Key Points: • Magnetic susceptibility showed strong correlation with LIC (rs =0.918). • QSM showed high diagnostic performance for LIC, similar to that of R2 * . • Simultaneously estimated FF-MRI showed strong correlation with MR-Spectroscopy-based FF (R2 =0.910). • QSM combining water-fat separation has quantitative value for LIO with coexisted steatosis.- Published
- 2018
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