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Abstract #3021

Diffusion Weighted 3D UTE Imaging Using Stimulated Echoes: Technical Considerations

Michael Carl1, Yajun Ma2, Graeme M Bydder2, and Jiang Du2

1Global MR Applications & Workflow, General Electric, San Diego, CA, United States, 2University of California San Diego, San Diego, CA, United States

Due to the fast decay rate of the transverse magnetization, diffusion weighting is challenging in short T2 tissues; only very limited b-values can be achieved before the signal decays to zero. In this work, we used stimulated echoes to allow spin diffusion while the magnetization is stored along the longitudinal axis, therefore achieving useful b-values and allowing examination of short T2 tissues. Several technical challenges have to be addressed however, such as minimizing the oscillatory signal banding due to the low diffusion gradient area and reducing T1 contamination in multi-spoke UTE acquisition. This initial proof-of-principle study shows good quantitative agreement with clinical EPI diffusion sequences.

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