This work aims to develop high-resolution 4D lung MRI with golden-angle 3D radial (kooshball) acquisition and motion-resolved sparse reconstruction. The golden-angle radial k-space lines were continuously acquired during free-breathing and retrospectively binned to multiple respiratory phases with respect to the respiratory signal obtained from a built-in motion-sensing camera. The sparsity along the respiratory motion dimension was exploited using compressed sensing reconstruction to suppress artifacts and improve SNR. The feasibility of half-spoke ultrashort echo time (UTE) and full-spoke 4D lung MRI was demonstrated on healthy volunteers on a clinical 3T MRI scanner.
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