Abstract #4413

HASTE imaging with EPI volumetric navigators for real-time fetal head motion detection

Borjan Gagoski^1,2, Patrick McDaniel³, André J. W. van der Kouwe^2,4, Himanshu Bhat⁵, Lawrence L. Wald^2,4,6, Elfar Adalsteinsson^3,6, P. Ellen Grant^1,2, and M. Dylan Tisdall^2,4

¹Fetal Neonatal Neuroimaging and Developmental Science Center, Boston Children's Hospital, Boston, MA, United States, ²Radiology, Harvard Medical School, Boston, MA, United States, ³Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, United States, ⁴Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA, United States, ⁵Siemens Medical Solutions USA Inc, Charlestown, MA, United States, ⁶Harvard-MIT Health Sciences and Technology, Institute of Medical Engineering and Science, Massachusetts Institute of Technology, Cambridge, MA, United States

Although heavily used in clinical fetal imaging due to its encoding efficiency, the image quality of T₂-weighted singe-shot fast-spin-echo (ss-FSE, or HASTE) acquisitions is often compromised by fetal head motion. We have implemented and tested an enhanced version of the HASTE acquisition scheme that includes EPI-based volumetric navigators (EPI-vNavs) played each TR, enabling detection and estimation of fetal head motion along six degrees of freedom in real time, while maintaining equivalent T₂ contrast in the fetal head compared to the original HASTE acquisition.

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