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Abstract #0415

Mapping of Muscle Strain Rate at Varying Force Levels of Isometric Contraction, with Compressed-Sensing Velocity-Encoded Phase-Contrast MR Imaging.

Shantanu Sinha1, Vadim Malis2, and Usha Sinha3

1Radiology, UC San Diego, San Diego, CA, United States, 2Physics, UC San Diego, San Diego, CA, United States, 3Physics, San Diego State University, San Diego, CA, United States

Strain rate (SR) tensor mapping can be conveniently computed from velocity encoded phase contrast (VE-PC) imaging. The study of the variation of strain rate indices with force output (% Maximum Voluntary Contraction (MVC)) can provide additional information similar to stress-strain relationships measured at the whole muscle level. However, such studies have been limited by the long VE-PC sequence time precluding its use at high MVCs. We have developed a compressed sensing VE-PCI technique to enable acquisitions across a range of MVCs. Successful SR mapping for 30-70%MVC on six subjects is reported here.

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