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- W2589961866 abstract "The progressive replacement of muscle tissue by fat in Duchenne muscular dystrophy (DMD) has been studied using quantitative MRI between, but not within, individual muscles. We studied fat replacement along the proximodistal muscle axis using the Dixon technique on a 3T MR scanner in 22 DMD patients and 12 healthy controls. Mean fat fractions per muscle per slice for seven lower and upper leg muscles were compared between and within groups assuming a parabolic distribution. Average fat fraction for a small central slice stack and a large coverage slice stack were compared to the value when the stack was shifted one slice (15 mm) up or down. Higher fat fractions were observed in distal and proximal muscle segments compared to the muscle belly in all muscles of the DMD subjects (p < 0.001). A shift of 15 mm resulted in a difference in mean fat fraction which was on average 1–2% ranging up to 12% (p < 0.01). The muscle end regions are exposed to higher mechanical strain, which points towards mechanical disruption of the sarcolemma as one of the key factors in the pathophysiology. Overall, this non-uniformity in fat replacement needs to be taken into account to prevent sample bias when applying quantitative MRI as biomarker in clinical trials for DMD." @default.
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- W2589961866 date "2017-05-01" @default.
- W2589961866 modified "2023-10-09" @default.
- W2589961866 title "Non-uniform muscle fat replacement along the proximodistal axis in Duchenne muscular dystrophy" @default.
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- W2589961866 doi "https://doi.org/10.1016/j.nmd.2017.02.009" @default.
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