Fig. 1

Respiratory motion resolution. a Four different respiratory states from a 5D motion-resolved reconstructed dataset are displayed in a coronal view, from end-expiration (R1) to end-inspiration (R4). b Average sharpness (over the 18 subjects) of the lung-liver interface for the 4 respiratory states. The difference between R1 and R2 did not reach the statistical significance threshold, and neither did the one between R3 and R4. c The interface sharpness values from the plot in b are displayed separately for intubated and free-breathing patients. No statistically significant difference was found between the two groups at any respiratory state