Video-based patient monitoring systems and associated methods for detecting and monitoring breathing
The present disclosure relates to the field of medical monitoring, and, in particular, to non-contact detecting and monitoring of patient breathing. Systems, methods, and computer readable media are described for calculating a change in depth of regions in one or more regions of interest (ROI's) on a patient and assigning one or more visual indicators to the regions based on the calculated changes in depth of the regions over time. In some embodiments, one or more breathing parameter signals corresponding to the regions can be generated and/or analyzed. In these and other embodiments, the one or more visual indicators can be displayed overlaid onto the regions in real-time. In these and still other embodiments, the systems, methods, and/or computer readable media (i) can display one or more generated breathing parameter signals in real-time and/or (ii) can trigger an alert and/or an alarm when a breathing abnormality is detected.
1 . A method of visually depicting changes in breathing of a patient, comprising:
using a camera to detect a depth within a field of view from the camera to a torso region of a patient;
measuring a change in the detected depth over time;
assigning a first visual indicator from a visual scheme when a measured change in depth is positive;
assigning a second visual indicator from the visual scheme when a measured change in depth is negative;
assigning a third visual indicator from the visual scheme when a measured change in depth is negligible or equivalent to zero, the first and second and third visual indicators being different from each other;
displaying on a display a video image of the patient;
modifying the displayed video image by overlaying the assigned first or second or third visual indicator onto the torso region of the patient in the displayed video image; and
visually depicting breathing activity of the patient in real-time by cyclically displaying the first and second visual indicators while the patient is breathing and displaying the third visual indicator while the patient is exhibiting apnea.
2 . The method of claim 1 , further comprising determining a respiratory rate of the patient from the measured change in depth over time.
3 . The method of claim 2 , further comprising triggering an alert upon determining that the respiratory rate of the patient crosses a threshold.
4 . The method of claim 3 , further comprising assigning a fourth visual indicator or no visual indicator to a region in the image that exhibits non-physiological or non-respiratory changes in depth.
5 . The method of claim 1 , wherein the first and second and third visual indicators exaggerate changes in depth detected by the camera.
6 . The method of claim 1 , wherein the visual scheme comprises a concentration of a pattern or a degree of an intensity or shade, wherein the concentration or the degree is positively correlated with the measured change in depth.
7 . The method of claim 1 , wherein overlaying the assigned first or second or third visual indicator onto the torso region of the patient in the displayed video image comprises overlaying onto a chest region of the patient at a first time and overlaying onto a back region of the patient at a second time.
8 . The method of claim 1 , wherein the display is remote from the camera.
9 . The method of claim 1 , further comprising determining a tidal volume signal from the measured change in detected depth over time, and displaying on the display a plot of the tidal volume signal, wherein the plot is displayed at the same time as the modified video image.
10 . The method of claim 1 , further comprising determining whether the patient is within the field of view prior to measuring the change in detected depth over time.
11 . The method of claim 1 , further comprising visually depicting paradoxical breathing of the patient by overlaying both the first visual indicator and the second visual indicator onto different regions of the displayed video image at the same time.