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Abstract #0982

4D Time-Resolved Strain Tensor Analysis Using Spectro-Dynamic MRI Reveals Muscle Activation Patterns

Max H.C. van Riel1, David G.J. Heesterbeek1, Ray S.S. Sheombarsing1, Martijn Froeling2, Tristan van Leeuwen3,4, Cornelis A.T. van den Berg1, and Alessandro Sbrizzi1
1Computational Imaging Group for MR diagnostics & therapy, Center for Image Sciences, UMC Utrecht, Utrecht, Netherlands, 2Highfield Research Group, UMC Utrecht, Utrecht, Netherlands, 3Mathematical Institute, Utrecht University, Utrecht, Netherlands, 4Computational Imaging Group, Centrum Wiskunde & Informatica, Amsterdam, Netherlands

Synopsis

Keywords: Functional/Dynamic, Analysis/Processing, Strain, Time-resolved

Motivation: In vivo biomechanical analysis can reveal novel information about the functioning of muscles. This information is preferably obtained dynamically, but this requires time-resolved reconstructions of deformations.

Goal(s): To measure time-resolved 4D strain tensors using the Spectro-Dynamic MRI framework to study dynamic muscle activations in vivo.

Approach: A pressure cuff compressed the muscles in the thigh, both with relaxed muscles and during isometric flexion of the knee. The experiment was repeated to investigate the repeatability.

Results: Time-resolved 4D motion fields can be robustly estimated at 3 Hz. The strain values reveal activation of the biceps femoris during isometric flexion of the knee.

Impact: Time-resolved 4D strain analysis using Spectro-Dynamic MRI enables the measurement of in vivo biomechanics in a dynamic setting. This creates an opportunity for new ways to investigate the functioning and performance of active muscles.

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