Abstract: A sensor system is provided for determining a pulse transit time measurement of a patient. The sensor system includes a carotid sensor device configured to be positioned on a neck of the patient over a carotid artery of the patient. The carotid sensor device is configured to detect a plethysmograph waveform from the carotid artery. The sensor system includes a temporal sensor device that is operatively connected to the carotid sensor device. The temporal sensor device is configured to be positioned on the patient over a temporal artery of the patient. The temporal sensor device is configured to detect a plethysmograph waveform from the temporal artery.

Abstract: A sensor fixture is provided for operatively attaching a photoacoustic (PA) sensor to a patient. The sensor fixture includes an acoustic coupling agent that is configured to allow the transmission of both acoustic energy and light therethrough. The sensor fixture includes a bracket configured to be affixed to skin of the patient. The bracket includes a cavity, a patient side, and a sensor side. The acoustic coupling agent is held within the cavity. The patient side includes a patient opening that is configured to expose the acoustic coupling agent along the patient side. The sensor side includes a sensor opening that is configured to expose the acoustic coupling agent along the sensor side. The sensor side includes a sensor cradle that is configured to hold the PA sensor such that the PA sensor is operatively attached to the acoustic coupling agent for receiving an acoustic response from the patient.

Abstract: A body-mounted photoacoustic sensor unit may use photoacoustic sensing to determine one or more physiological parameters of a subject. The body-mounted photoacoustic sensor unit may fixably locate a light source and photoacoustic detector relative to a target area. The photoacoustic detector may detect an acoustic pressure response generated by the application and absorption of light from the light source.