The modern era of ultrasound detectors began in the late 1960s. Today, millions of parents-to-be show off pictures of babies still in the womb, but Diagnostic Medical Sonography has broader applications. The technology is used in evaluating heart function, assessing blood flow to carotid arteries and examining organs of the abdominal cavity. The use of sound waves in medical diagnosis has its roots in the development of naval sonar, radar and specialized equipment that detected flaws in metal. A doctor at the Naval Medical Research Institute in the late 1940s used metal flaw detectors and naval sonar to find gall bladder stones. That is considered the first diagnostic use.

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