Abstract: Various methods and systems for the use of multi-element photoacoustic sensors within medical devices configured for photoacoustic spectroscopy techniques are provided. The photoacoustic sensor includes two or more acoustic detectors spatially configured to increase the probability of a clinician properly placing at least one of the acoustic detectors on the measurement site over the blood vessels of interest. Further, the photoacoustic sensor includes a light delivery system configured to provide multiple light sources to the measurement site, such that each acoustic detector has an adequate light supply within close proximity. The present techniques additionally provide methods for processing each acoustic signal measured at the two or more acoustic detectors to calculate one or more physiological parameters of interest, such as cardiac output.

Abstract: Various methods and systems for photoacoustic patient monitoring are provided. A photoacoustic system includes a light emitting component that emits one or more wavelengths of light into an interrogation region of a patient and an acoustic detector that detects acoustic energy generated by the interrogation region of the patient in response to the emitted light. A reflective coating is disposed on the light emitting component, the acoustic detector, the patient, or a combination thereof to direct the emitted light toward the interrogation region of the patient.