Figure 4. Comparison of right and left lung xt-PCA tidal breathing signal in a healthy volunteer (top row) and in a patient with right diaphragmatic palsy (DP) (bottom row). The dysfunction of the right lung in the patient manifests as a disproportionate diaphragmatic excursion with a compensatory larger signal in the left lung.

Figure 3. Results of xt-PCA diaphragm motion extraction in a healthy volunteer (top row) and a postsurgical patient following robotic plication and chest wall reconstruction (bottom row). A comparison of tidal breathing and maximum inspiration and expiration shows a number of potentially useful features for diagnosis, including amplitude, frequency and regularity. Both figures are animated to the same time scale and included on each figure is the mean signal (black) and ±1σ standard deviation (grey).