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MR Imaging in Duchenne Muscular Dystrophy: Quantification of T-1-Weighted Signal, Contrast Uptake, and the Effects of Exercise

Lookup NU author(s): Dr Penelope Garrood, Dr Kieren Hollingsworth, Dr Michelle Eagle, Dr Benjamin Aribisala, Dr Daniel Birchall, Emerita Professor Katherine Bushby, Professor Volker Straub

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Abstract

Purpose: To quantify the differences between normal and corticosteroid-treated Duchenne muscular dystrophy (DMD) lower limb muscle using signal intensity measurements on T-1-weighted and gadolinium contrast-enhanced images and by measurement of muscle T-2 values, and to investigate the effect of exercise. Materials and Methods: Eleven ambulant boys with DMID were imaged at 3 Tesla (T-1-weighted, gadolinium enhancement and T-2 measurement) before stepping exercise and again (gadolinium, T-2 measurement) 4 days later and were compared with five healthy controls imaged 4 days before and after stepping exercise. Muscle region-of-interest signal intensities were referenced to external oil and gadolinium phantoms. Results: DMD thigh muscle T-2 values were significantly higher than normal values with the exception of the gracilis muscle. Eight of nine muscles studied showed a significant increase in T-1-w signal intensity in DMD as compared to normal muscle, suggestive of increased fat infiltration in DMD muscle. In the DMD boys, an exercise effect (increased contrast enhancement) was only seen for the tibialis anterior muscle. Conclusion: Referenced signal intensity measurements may be used to quantify differences between dystrophic and normal muscle without T-1 mapping. Stepping exercise does not have a large impact on subsequent MR imaging of dystrophic muscle.


Publication metadata

Author(s): Garrood P, Hollingsworth KG, Eagle M, Aribisala BS, Birchall D, Bushby K, Straub V

Publication type: Article

Publication status: Published

Journal: Journal of Magnetic Resonance Imaging

Year: 2009

Volume: 30

Issue: 5

Pages: 1130-1138

ISSN (print): 1053-1807

ISSN (electronic): 1522-2586

Publisher: John Wiley & Sons, Inc.

URL: http://dx.doi.org/10.1002/jmri.21941

DOI: 10.1002/jmri.21941


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