Abstract: Systems and methods for detecting an occurrence of a transient ischemic attack (TIA). In one embodiment, a device is utilized to measure first and second signals indicative of photoplethysmogram signals at first and second regions on the left and right sides of a user's head (PPGSL and PPGSR, respectively). A computer detects the occurrence of a TIA based on PPGSL and PPGSR that exhibit a pattern that involves the following: (i) an asymmetry between PPGSL and PPGSR, which is below a threshold, during a first period spanning more than a day; (ii) an asymmetry between PPGSL and PPGSR, which exceeds the threshold, during a second period following the first period and spanning between 5 and 180 minutes; and (iii) an asymmetry between PPGSL and PPGSR, which falls below the threshold, during a third period following the second period.

Abstract: Described herein are embodiments of systems and methods for calculating glucose in a non-invasive manner using head-mounted sensors. In one embodiment, a system that calculates blood glucose levels includes a head-mounted contact photoplethysmography device that measures a signal indicative of a photoplethysmogram signal (PPG signal) at a first region comprising skin on a user's head, and a head-mounted camera configured to capture images of a second region comprising skin on the user's head. The system also includes a computer that identifies, based on the PPG signal, times of systolic notches and times of systolic peaks, and calculates the blood glucose level based on differences between a first subset of the images taken during the times of systolic notches and a second subset of the images taken during the times of systolic peaks. Optionally, the photoplethysmography device and the camera are couple to smartglasses worn on the user's head.

Abstract: A hygienic in-vehicle head-mounted display (HMD) includes: a head piece, a stiff module, and a lock that connects and disconnects the head piece and the stiff module. The head piece is in direct physical contact with the passenger's face. The stiff module includes a display module that projects video into eyes of a passenger of a vehicle while the HMD is worn by the passenger. In one embodiment, a storage module may be used to stow the stiff module. Optionally, the storage module releases the stiff module responsive to the head piece being connected to the stiff module. In another embodiment, a processor instructs the display module to project video responsive to an indication that the head piece and the stiff module are connected, and instructs the display module not to project the video, responsive to an indication that the head piece and the stiff module are not connected.

Abstract: Described herein are embodiments of systems and methods that utilize temperature measurements taken with head-mounted sensors as well as images of a user's face to detect fever and/or intoxication. One embodiment of a system to detect fever includes a first head-mounted temperature sensor that measures skin temperature (Tskin) at a first region on a user's head, a second head-mounted temperature sensor that measures a temperature of the environment (Tenv), and a computer. The computer receives images of a second region on the user's face, captured by a camera sensitive to wavelengths below 1050 nanometer, and calculates, based on the images, values indicative of hemoglobin concentrations at three or more regions on the user's face. The computer can then detect whether the user has a fever based on Tskin, Tenv and the values.

Abstract: Described herein are embodiments of systems and methods that utilize images of a user's face to detect fever and intoxication. One embodiment of a system to detect fever includes first and second inward-facing head-mounted cameras that are located less than 5 cm from a user's face, are sensitive to wavelengths below 1050 nanometer, and are configured to capture images of respective first and second regions on the user's face. The system also includes a computer that calculates, based on baseline images captured with the cameras while the user did not have a fever, a baseline pattern of hemoglobin concentrations at regions on the face. The computer also calculates, based on a current set of images captured with the cameras, a current pattern of hemoglobin concentrations at the regions, and detects whether the user has a fever based on a deviation of the current pattern from the baseline pattern.

Abstract: Head-mounted displays (HMDs) are being used more and more for entertainment and work while traveling in vehicles. However, the use of an HMD can be risky in the event of a collision. This disclosure describes a safety system comprising a head-mounted display (HMD) configured to be worn on a passenger's head while traveling in an automated on-road vehicle, a folded airbag, fixed to the HMD, and an inflation system fixed to the vehicle and connected to the folded airbag through a flexible hose. The flexible hose is configured to convey as generated by the inflation system. The system may further detach the flexible hose from the inflation system after the inflation, such that the airbag is no longer connected to the inflation system shortly after the inflation.

Abstract: Detecting a respiratory tract infection (RTI) based on changes in coughing sounds, which can provide an early warning of infection with a disease like COVID-19, as well as indications of its progression and severity. In one embodiment, the system includes smartglasses, with sensors mounted thereto, which include an acoustic sensor mounted at a fixed position relative to a user's head, and a movement sensor. A computer receives current measurements of the user, taken with the sensors, while there were head movements that characterize coughing, and also earlier measurements of the user, taken with the sensors, while the user had a known extent of the RTI and while there were head movements that characterize coughing. The computer detects a change relative to the known extent of the RTI based on a difference between the current measurements and the earlier measurements.

Abstract: Disclosed herein are systems and methods for detecting a physiological response using different types of photoplethysmography sensors. Examples of physiological responses that may be detected include an allergic reaction, a stroke, a migraine, stress, certain emotional responses, manifestation of pain, and blood pressure. In one embodiment, a head-mounted contact photoplethysmography device measures a signal indicative of photoplethysmogram signal at a first region that includes exposed skin on a user's head (PPG signal). A camera, located more than 10 mm away from the user's head, captures images of a second region that includes exposed skin on the user's head. A computer detects the physiological response based on: (i) imaging photoplethysmogram signals (iPPG signals) recognizable in the images, and (ii) correlations between the PPG signal and the iPPG signals.

Abstract: Systems for calculating extent of congestive heart failure (CHF) and/or identifying exacerbation of CHF. In one embodiment, a system includes smartglasses configured to be worn on a user's head, and an inward-facing camera and a sensor, both physically coupled to the smartglasses. The inward-facing camera is mounted more than 5 mm away from the head and captures images of an area comprising skin on the user's head, which is larger than 4 cm{circumflex over (?)}2. The sensor measures a signal indicative of a respiration rate of the user (respiration signal). The system also includes a computer that calculates the extent of CHF based on: a facial blood flow pattern recognizable in the images, and respiration rate recognizable in the respiration signal.

Abstract: Detecting a respiratory tract infection (RTI) based on changes in coughing sounds, which can provide an early warning of infection with a disease like COVID-19, as well as indications of its progression and severity. In one embodiment, the system includes smartglasses, with sensors mounted thereto, which include an acoustic sensor mounted at a fixed position relative to a user's head, and a movement sensor. A computer receives current measurements of the user, taken with the sensors, while there were head movements that characterize coughing, and also earlier measurements of the user, taken with the sensors, while the user had a known extent of the RTI and while there were head movements that characterize coughing. The computer detects a change relative to the known extent of the RTI based on a difference between the current measurements and the earlier measurements.

Abstract: Systems for calculating extent of congestive heart failure (CHF) and/or identifying exacerbation of CHF. In one embodiment, a system includes smartglasses configured to be worn on a user's head, and an inward-facing camera and a sensor, both physically coupled to the smartglasses. The inward-facing camera is mounted more than 5 mm away from the head and captures images of an area comprising skin on the user's head, which is larger than 4 cm{circumflex over (?)}2. The sensor measures a signal indicative of a respiration rate of the user (respiration signal). The system also includes a computer that calculates the extent of CHF based on: a facial blood flow pattern recognizable in the images, and respiration rate recognizable in the respiration signal.

Abstract: Described herein are embodiments of systems and a method to identify orthostatic hypotension and postural-orthostatic tachycardia syndrome. One system includes a head-mounted device configured to measure photoplethysmographic signal (PPG signal) at a region on a user's head, and a head-mounted camera configured to capture images indicative of the user's posture. Additionally, the system includes a computer that calculates systolic and diastolic blood pressure values based on the PPG signal, and identifies orthostatic hypotension based on a drop of systolic blood pressure below a first threshold, and/or a drop of diastolic blood pressure below a second threshold, within a predetermined duration from a transition in the posture from supine to sitting posture, or from sitting to standing posture.

Abstract: A hygienic in-vehicle head-mounted display (HMD) includes: a head piece, a stiff module, and a lock that connects and disconnects the head piece and the stiff module. The head piece is in direct physical contact with the passenger's face. The stiff module includes a display module that projects video into eyes of a passenger of a vehicle while the HMD is worn by the passenger. In one embodiment, a storage module may be used to stow the stiff module. Optionally, the storage module releases the stiff module responsive to the head piece being connected to the stiff module. In another embodiment, a processor instructs the display module to project video responsive to an indication that the head piece and the stiff module are connected, and instructs the display module not to project the video, responsive to an indication that the head piece and the stiff module are not connected.

Abstract: System and Method to detect an abnormal medical event based on an asymmetrical change to blood flow. The system includes right-side and left-side head-mounted devices to measure signals indicative of photoplethysmographic signals (PPG signals) on the right and left sides of a user's head, and a computer that detects the abnormal medical event based on an asymmetrical change to blood flow recognizable in the PPG signals. Optionally, the asymmetrical change to the blood flow corresponds to a deviation of the PPG signals compared to a baseline that is based on previous measurements of PPG signals of the user, taken before the abnormal medical event.

Abstract: Head-mounted displays (HMDs) are being used more and more for entertainment and work while traveling in vehicles. However, the use of an HMD can be risky in the event of a collision if it is not removed from the head in time. This disclosure describes HMDs that are dismantled automatically from the heads of passengers in vehicles. In one embodiment, an HMD includes a display module and a mount that includes a first piece and a second piece connected by a lock. The mount attaches the display module to a passenger's head while the pieces are connected. Upon receiving an indication of an imminent collision involving the vehicle, the lock disconnects the pieces such that the first piece stays on the head shortly after the disconnection, and the second piece is removed together with the display module from the head shortly after the disconnection.

Abstract: Disclosed herein are systems and methods for detecting a physiological response using different types of photoplethysmography sensors. Examples of physiological responses that may be detected include an allergic reaction, a stroke, a migraine, stress, certain emotional responses, manifestation of pain, and blood pressure. In one embodiment, a head-mounted contact photoplethysmography device measures a signal indicative of photoplethysmogram signal at a first region that includes exposed skin on a user's head (PPG signal). A camera, located more than 10 mm away from the user's head, captures images of a second region that includes exposed skin on the user's head. A computer detects the physiological response based on: (i) imaging photoplethysmogram signals (iPPG signals) recognizable in the images, and (ii) correlations between the PPG signal and the iPPG signals.

Abstract: Systems and methods for detecting an occurrence of a transient ischemic attack (TIA). In one embodiment, a device is utilized to measure first and second signals indicative of photoplethysmogram signals at first and second regions on the left and right sides of a user's head (PPGSL and PPGSR, respectively). A computer detects the occurrence of a TIA based on PPGSL and PPGSR that exhibit a pattern that involves the following: (i) an asymmetry between PPGSL and PPGSR, which is below a threshold, during a first period spanning more than a day; (ii) an asymmetry between PPGSL and PPGSR, which exceeds the threshold, during a second period following the first period and spanning between 5 and 180 minutes; and (iii) an asymmetry between PPGSL and PPGSR, which falls below the threshold, during a third period following the second period.

Abstract: Head-mounted displays (HMDs) are being used more and more for entertainment and work while traveling in vehicles. However, the use of an HMD can be risky in the event of a collision if it is not removed from the head in time. This disclosure describes HMDs that are dismantled automatically from the heads of passengers in vehicles. In one embodiment, an HMD includes a display module and a mount that includes a flexible piece and a stiff piece connected by a lock. The mount attaches the display module to a passenger's head while the pieces are connected. Upon receiving an indication of an imminent collision involving the vehicle, the lock disconnects the pieces such that the flexible piece stays on the head shortly after the disconnection, and the stiff piece is removed from the head shortly after the disconnection.

Abstract: Head-mounted displays (HMDs) are being used more and more for entertainment and work while traveling in vehicles. However, the use of an HMD can be risky in the event of a collision if it is not removed from the head in time. This disclosure describes HMDs that are dismantled automatically from the heads of passengers in vehicles. In one embodiment, an HMD includes a display module and a mount that includes a flexible piece and a stiff piece connected by a lock. The mount attaches the display module to a passenger's head while the pieces are connected. Upon receiving an indication of an imminent collision involving the vehicle, the lock disconnects the pieces such that the flexible piece stays on the head shortly after the disconnection, and the stiff piece is removed from the head shortly after the disconnection.

Abstract: Disclosed herein are embodiments of a system that utilizes measurements indicative of respiration in order to estimate an aerobic activity parameter, such as oxygen consumption (VO2), maximal oxygen consumption (VO2 max), or energy expenditure (EE). In one embodiment, this system includes at least one inward-facing head-mounted thermal camera (CAM) and a computer. Each CAM, from among the at least one CAM, is configured to take thermal measurements of a region below the nostrils (THRBN) of a user. THRBN are indicative of an exhale stream of the user, such as an exhale stream from one, or both, of the nostrils and/or the exhale from the mouth. The computer calculates, based on THRBN, the aerobic activity parameter. Optionally, the computer generates feature values based on data comprising THRBN and utilizes a model to calculate the aerobic activity parameter based on the feature values.