MRI of lungs is inherently challenging due to the short T2* and intrinsic motion from the respiratory and cardiac cycles. Ultrashort echo-time (UTE) sequences are often implemented for their shorter echo times and relative insensitivity to motion. Spiral UTE sequences have been touted recently as having greater k-space sampling efficiencies than radial UTE, but few are designed well for the shorter T2* of lung. In this study, FLORET (Fermat looped, orthogonally encoded trajectories), a recently-developed spiral 3D UTE sequence, was implemented in human lungs for the first time and outperformed traditional radial UTE for imaging of lung tissue.
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