Abstract
Objectives
Conventional imaging techniques are insensitive to liver fibrosis. This study assesses the diagnostic accuracy of MR elastography (MRE) stiffness values and the ratio of phosphomonoesters (PME)/phosphodiesters (PDE) measured using 31P spectroscopy against histological fibrosis staging.
Methods
The local research ethics committee approved this prospective, blinded study. A total of 77 consecutive patients (55 male, aged 49 ± 11.5 years) with a clinical suspicion of liver fibrosis underwent an MR examination with a liver biopsy later the same day. Patients underwent MRE and 31P spectroscopy on a 1.5 T whole body system. The liver biopsies were staged using an Ishak score for chronic hepatitis or a modified NAS fibrosis score for fatty liver disease.
Results
MRE increased with and was positively associated with fibrosis stage (Spearman’s rank = 0.622, P < 0.001). PME/PDE was not associated with fibrosis stage (Spearman’s rank = −0.041, p = 0.741). Area under receiver operating curves for MRE stiffness values were high (range 0.75–0.97). The diagnostic utility of PME/PDE was no better than chance (range 0.44–0.58).
Conclusions
MRE-estimated liver stiffness increases with fibrosis stage and is able to dichotomise fibrosis stage groupings. We did not find a relationship between 31P MR spectroscopy and fibrosis stage.
Key Points
• Magnetic resonance elastography (MRE) and MR spectroscopy can both assess the liver.
• MRE is superior to 31 P MR spectroscopy in staging hepatic fibrosis.
• MRE is able to dichotomise liver fibrosis stage groupings.
• Gradient-echo MRE may be problematic in genetic haemochromatosis.
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Addenbrooke’s Charitable Trust
NIHR - Cambridge Biomedical Research Centre
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Godfrey, E.M., Patterson, A.J., Priest, A.N. et al. A comparison of MR elastography and 31P MR spectroscopy with histological staging of liver fibrosis. Eur Radiol 22, 2790–2797 (2012). https://doi.org/10.1007/s00330-012-2527-x
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DOI: https://doi.org/10.1007/s00330-012-2527-x