Abstract #0536

Variable-flip-angle 3D spiral-in-out TSE/SPACE using echo-reordering and concomitant gradient compensation at 0.55 T

Zhixing Wang¹, Rajiv Ramasawmy², Ahsan Javed², John P. Mugler³, Craig H. Meyer^1,3, and Adrienne E. Campbell-Washburn²

¹Biomedical Engineering, University of Virginia, Charlottesville, VA, United States, ²Cardiovascular Branch, Division of Intramural Research, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, United States, ³Radiology & Medical Imaging, University of Virginia, Charlottesville, VA, United States

Synopsis

Keywords: Data Acquisition, Data AcquisitionThis study describes an alternative approach to Cartesian SPACE for 1 mm³ isotropic whole brain T₂-weighted imaging on a high performance 0.55T scanner. In this technique, the Cartesian readouts were replaced by interleaved, rotated spiral-in-out trajectories, combined with a variable-flip-angle refocusing, echo-reordering, and concomitant gradient compensation. Parallel imaging (PI) and compressed sensing (CS) were utilized for further acceleration. Compared to 3D-Cartesian SPACE, this method can be leveraged to mitigate the lower SNR of 0.55T via the improved SNR efficiency of prolonged spiral trajectory sampling.

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