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Abstract #3497

High-quality Lung imaging with FLORET UTE and Fibonacci interleaved trajectory ordering

Guruprasad Krishnamoorthy1, Matthew M Willmering2, Jason C Woods2,3, and James G Pipe4
1MR R&D, Philips Healthcare, Rochester, MN, United States, 2Center for Pulmonary Imaging Research, Divisions of Pulmonary Medicine and Radiology, Cincinnati Children’s Hospital Medical Center, Cincinnati, OH, United States, 3Departments of Pediatrics, Radiology, and Physics, University of Cincinnati College of Medicine, Cincinnati, OH, United States, 4Department of Radiology, Mayo Clinic, Rochester, MN, United States


FLORET (Fermat looped, orthogonally encoded trajectories) is an efficient center-out 3D spiral trajectory, and it supports ultra-short echo times. In this work, a new trajectory ordering scheme and FLORET balanced steady-state free precession (FLORET-bSSFP) were developed at 1.5T with inline reconstruction. Simulations, phantom, and human lung imaging were performed to compare the performance of the proposed trajectory ordering with standard ordering. The proposed trajectory ordering scheme minimized artifacts caused by the changing gradient moments while improving temporal stability and motion robustness. High-quality free-breathing lung images were obtained using FLORET-bSFFP and spoiled gradient echo-based UTE FLORET.

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