Density-Controllable Spiral Trajectory Design Combined with CS-UTE Improves High-Resolution Single Breath-Hold Lung Imaging

Single breath-hold high-resolution lung imaging is challenging due to the short T2* and scan efficiency. The stack-of-spirals UTE enables fast lung imaging in a single breath hold. However, fast scanning of stack-of-spirals results in a long readout time, introducing adverse effects of the short T2* of the lung. Herein, we proposed a density-controllable spiral trajectory (DCST) design method to design a short readout time trajectory concurrently satisfying the criteria of optimal compressed sensing (CS), reducing the adverse effect of the short T2*. The short readout time trajectory combined with CS-UTE improves the single breath-hold high-resolution lung imaging.