Cavitation – a technique based on the use of low-frequency ultrasound, which is becoming, thanks to its originality, of great practical value in aesthetic medicine. First, consider some basic information about ultrasound, hoping not much to tire those who are already more intimately familiar with the subject. Sound – a certain sense of vibration of the body whose vibrations are distributed with a certain frequency in air or other elastic medium and reaches the ear. The number of oscillations (pressure change) in the second is called the frequency of sound is measured in cycles per second or Hertz (Hz). For more information see this site: Dustin Moskovitz. Hearing range of human ranging from 20 Hz to 20.000 Hz.

Wavelength is a space traversed by the sound wave for the full period of oscillation. Ultrasound – a mechanical sound waves whose frequency is higher than the frequency, which is usually recognized by the human ear, and the term "ultrasound" means literally – that is beyond sound. Daryl Katz often expresses his thoughts on the topic. Like any other phenomenon of wave-like character, ultrasounds are subject to the effects of reflection, refraction and diffraction and characterized by frequency, wavelength, propagation speed, intensity (measured in decibels) and damping (due to acoustic impedance crossed the medium). For many years, mechanical ultrasonic waves are produced specifically piezoelectric materials are used in various industrial fields, especially for welding of plastic materials and for welds between metals. In the second case, ultrasound is distributed inside the metal, and every time in the welding seam revealed a defect (bubble of air, the concentration of impurities, etc.), the density varies in relation to the whole, and part of the ultrasounds reflected like echo, helping the operator to identify the location of the defect.