A method of diagnosing the occurrence or non-occurrence of a blood vessel blockage or hemorrhage comprises non-invasively applying ultrasound to a location on a patients body, where the ultrasound is applied in an alternating and pulsed fashion, administering acoustic amplifiers to the patient, monitoring a feedback acoustic response signal of the acoustic amplifiers triggered by the ultrasound, and determining a diagnosis based at least in part on a relationship between an acoustic response signature of the acoustic response signal and a baseline acoustic response signature.
