Free-breathing renal R2*/QSM using 3D multi-echo UTE cones acquisition and motion-resolved reconstruction with image-based self-navigator

Respiratory motion is a significant challenge for the acquisition of reliable renal R2*/QSM. The combination of 3D multi-echo UTE cones MRI and respiratory motion-resolved image reconstruction with an image-based self-navigator was developed to enable motion-robust renal R2*/QSM. Motion-resolved reconstruction with an image-based self-navigator showed better image quality compared to conventional gridding reconstruction and higher apparent SNR and CNR compared to motion-resolved reconstruction using the center of the k-space as navigator. 3D multi-echo UTE cones MRI and motion-resolved image reconstruction with image-based self-navigator demonstrated the feasibility of motion-robust, free-breathing, and high isotropic resolution of renal R2*/QSM.