Fig. 5: Visualisation of the local respiratory effort of a patient later diagnosed as having a ruptured diaphragm, as confirmed by chest CT, and a right-sided pneumothorax.
From: Non-contact physiological monitoring of post-operative patients in the intensive care unit
(a) Respiratory rate estimated from the camera. Heat maps show the magnitude of the respiratory effort from regions on the chest during time stages (b) S1, (c) S2 and (d) S3. Each super-pixel in the heat maps was coloured according to the amplitude of the respiratory signal (in pixel units) computed from the 30 × 30 ROI centred on the super-pixel. The non-stationary respiratory rate was measured with a sustained increase in respiratory rate from t = 18 min to t = 27 min. A progression towards subdiaphragmatic left-lateral respiratory movements is observed as increased signal intensity over the lower left-side in the respiratory map for stage S3.
