Ultrasounds Importance in the Clinic and Medical Diagnostics

17 Ultrasounds are acoustic vibrations that are not perceived by the human ear as their frequency is greater than 20,000 Hz. They are artificially generated by the action of the electric current, whose polarity is periodically reversed, on a quartz crystal, subjecting it, by the action of the electromagnetic field created, to successive contractions and expansions. This alternation of movements generates vibrations, which, transmitted to cellular and intercellular structures, cause collisions and generate heat [1].