Abstract #1772

3D Stack-of-Stars Radial Imaging for Motion-Robust Free-Breathing Hepatobiliary Phase Imaging

Matthias R Muehler¹, Ty A Cashen², Kang Wang², Ali Ersoz³, Ersin Bayram⁴, and Scott B Reeder^1,5,6,7

¹Departments of Radiology, University of Wisconsin, Madison, WI, United States, ²Global MR Applications and Workflow, GE Healthcare, Madison, WI, United States, ³Global MR Applications and Workflow, GE Healthcare, Waukesha, WI, United States, ⁴Global MR Applications and Workflow, GE Healthcare, Houston, TX, United States, ⁵Biomedical Engineering, University of Wisconsin, Madison, WI, United States, ⁶Medical Physics, University of Wisconsin, Madison, WI, United States, ⁷Medicine and Emergency Medicine, University of Wisconsin, Madison, WI, United States

Free-breathing hepatobiliary phase imaging with gadoxetate disodium is challenging due to respiratory motion. This study examines an intrinsically motion-robust fat-suppressed T1-weighted 3D stack-of-stars gradient echo technique (LAVA Star) with soft gating. An estimate of respiratory motion is derived either from a navigator tracker with a wide acceptance window, which produces the best image quality, or self-navigation, which offers the most convenient workflow, particularly in challenging clinical situations. In either case, the retrospective soft gating reduces scan time variability compared to a conventional prospective navigator.

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