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Abstract #0816

In vivo Comparison of Ultrashort Echo Time (UTE) and Zero Echo Time (ZTE) MRI at 7T

Peder Eric Zufall Larson 1 , Misung Han 1 , Sarah J. Nelson 1 , Daniel B. Vigneron 1 , Roland Krug 1 , and Douglas A. C. Kelley 2

1 Radiology and Biomedical Imaging, University of California - San Francisco, San Francisco, CA, United States, 2 Neuro Apps and Workflow, GE Healthcare, Corte Madera, CA, United States

Detection of short-T2 (< 1ms) semi-solid tissue components, such as in tendons, calcified cartilage, the meninges, and myelin, is limited with Cartesian MRI acquisitions due minimum TEs. Two promising approaches for imaging these components are ultrashort echo time (UTE) and zero echo time (ZTE) pulse sequences. ZTE and UTE MRI acquired at 7T in the brain, ankle, and knee demonstrated similar tissue contrast with matched acquisition parameters. UTE offers advantages of slab or slice selection and supports variable TEs. ZTE provides a shorter TE, is practically insensitive to gradient infidelity, and is relatively quiet due to slow gradient switching.

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