Ultrasound has been used for many years to help diagnosis. Ultrasound describes sound frequencies beyond the range of normal human hearing and 20 kilohertz. Ultrasound uses focused low-energy ultrasound waves to visualize the interior of the body in a noninvasive and painless way. Many people are to thanks for the evolution of ultrasound. Dating back to the 1700’s. Lazzaro Spallanzani in 1793 observed that bats function efficiently in the dark, even when blinded, but not if deafened. He theorized that bats could hear something we couldn’t. Then Christian Doppler in 1842 created the Doppler Effect, which is when a source of wave motion moves, the wave changes let off apparent frequency. In 1880 Jacque and Pierre Curie used the piezoelectric
