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01.07.2012 | Musculoskeletal

Comparison of clinical semi-quantitative assessment of muscle fat infiltration with quantitative assessment using chemical shift-based water/fat separation in MR studies of the calf of post-menopausal women

verfasst von: Hamza Alizai, Lorenzo Nardo, Dimitrios C. Karampinos, Gabby B. Joseph, Samuel P. Yap, Thomas Baum, Roland Krug, Sharmila Majumdar, Thomas M. Link

Erschienen in: European Radiology | Ausgabe 7/2012

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Abstract

Objective

The goal of this study was to compare the semi-quantitative Goutallier classification for fat infiltration with quantitative fat-fraction derived from a magnetic resonance imaging (MRI) chemical shift-based water/fat separation technique.

Methods

Sixty-two women (age 61 ± 6 years), 27 of whom had diabetes, underwent MRI of the calf using a T1-weighted fast spin-echo sequence and a six-echo spoiled gradient-echo sequence at 3 T. Water/fat images and fat fraction maps were reconstructed using the IDEAL algorithm with T2* correction and a multi-peak model for the fat spectrum. Two radiologists scored fat infiltration on the T1-weighted images using the Goutallier classification in six muscle compartments. Spearman correlations between the Goutallier grades and the fat fraction were calculated; in addition, intra-observer and inter-observer agreement were calculated.

Results

A significant correlation between the clinical grading and the fat fraction values was found for all muscle compartments (P < 0.0001, R values ranging from 0.79 to 0.88). Goutallier grades 0–4 had a fat fraction ranging from 3.5 to 19%. Intra-observer and inter-observer agreement values of 0.83 and 0.81 were calculated for the semi-quantitative grading.

Conclusion

Semi-quantitative grading of intramuscular fat and quantitative fat fraction were significantly correlated and both techniques had excellent reproducibility. However, the clinical grading was found to overestimate muscle fat.

Key Points

• Fat infiltration of muscle commonly occurs in many metabolic and neuromuscular diseases.

• Image-based semi-quantitative classifications for assessing fat infiltration are not well validated.

• Quantitative MRI techniques provide an accurate assessment of muscle fat.

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Titel: Comparison of clinical semi-quantitative assessment of muscle fat infiltration with quantitative assessment using chemical shift-based water/fat separation in MR studies of the calf of post-menopausal women
verfasst von: Hamza Alizai
Lorenzo Nardo
Dimitrios C. Karampinos
Gabby B. Joseph
Samuel P. Yap
Thomas Baum
Roland Krug
Sharmila Majumdar
Thomas M. Link
Publikationsdatum: 01.07.2012
Verlag: Springer-Verlag
Erschienen in: European Radiology / Ausgabe 7/2012
Print ISSN: 0938-7994
Elektronische ISSN: 1432-1084
DOI: https://doi.org/10.1007/s00330-012-2404-7

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Comparison of clinical semi-quantitative assessment of muscle fat infiltration with quantitative assessment using chemical shift-based water/fat separation in MR studies of the calf of post-menopausal women