High-performance 0.55T MRI is promising for lung imaging due to the reduced susceptibility artifacts. However, high-resolution lung imaging is still challenged by low proton density and SNR. 3D spiral acquisitions can be used to improve SNR-efficiency, but these readouts are susceptible to trajectory errors and blurring from concomitant-fields, which are amplified at lower field strengths. Here we present a self-gated, ultra-short echo-time, stack-of-spirals acquisition which leverages rapid inline corrections for trajectory imperfections, trajectory dependent navigator signal fluctuations, and concomitant-fields to enable robust 1.75mm isotropic lung imaging at 0.55T. We also demonstrate our technique in healthy-volunteers, patients with lung-nodules and COVID-19.
This abstract and the presentation materials are available to members only; a login is required.