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Abstract #4057

Time-dependent diffusion in healthy adult human thigh muscle in a clinically feasible acquisition

Amy McDowell1, Thorsten Feiweier2, Carolynne Doherty1, Stephen J Wastling1, Matt G Hall3, Chris A Clark4, Tarek Yousry5, Mary Reilly1, and John S Thornton1
1Queen Square Centre for Neuromuscular Diseases, University College London, London, United Kingdom, 22Siemens Healthcare GmbH, Erlangen, Germany, 3Medical Radiation Physics, National Physical Laboratory, London, United Kingdom, 4Developmental Imaging and Biophysics, University College London, London, United Kingdom, 5Queen Square Institute of Neurology, University College London, London, United Kingdom

Synopsis

Keywords: Muscle, Diffusion Tensor ImagingMuscle fibres are larger than axons with a complex hierarchical internal structure causing a decrease in the diffusion coefficient with diffusion time. Acquisition of larger field-of-view thigh-level images is challenged by increased distortion, higher B0 inhomogeneity, incomplete fat saturation and longer acquisition times. We optimised a protocol to study the time-dependence of diffusion indices in healthy human thigh muscle in a clinically feasible scan time. MD and FA showed strong time dependence but slight disparities from previous work in the calf, possibly due to differences in the musculature of the thigh, male/female ratio, or changes in the acquisition with optimisation.

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