Yet, until these studies are incomplete. But it is certain that, if only theoretically used, for example, the frequency of 1 MHz and intensity of the ultrasound beam on a single zone, equal to more than 30 V / cm square. (A higher power, because according to current standards denotes the limit of equal to 3 V / cm-sq.) Would be recorded rapid growth of many micro-bubbles, which in a few microseconds would have provoked the strongest implosion: as a result, would significantly increase the temperature and pressure at the surface smaller than the first one square millimeter, with the expansion of nearby cells and tissues. Another well-known parameter, it is a constant threshold cavitation in water, which is equal to about 100 mW/cm2, whereas the threshold unstable cavitation in water is 1 W/cm2. The latter threshold is directly proportional to the dispersion of gas in a liquid medium, temperature and viscosity of the fluid itself (this means you need to slightly increase the power handling of live tissues and biological fluids). ‘ll Make it a concrete example. When is the echographic study during pregnancy, the fetus is in amniotic fluid, so power should be below 100 mW/cm2 precisely in order to avoid the effects of cavitation.
And, conversely, to obtain this effect it is necessary to resort to power above the designated threshold (1 W/cm2) and low frequency from 0,02 – 0,03 MHz, but not to exceed a threshold of 0.03 MHz, which is a conditional limit the use of ultrasounds in aesthetic medicine. In conclusion, it should be noted that only the anatomy of the human body is able to give a complete picture of the location of the arteries and veins, glands and internal organs, which may be inadvertently affected by the low-frequency ultrasound. Important as the location and depth of cellulite and fatty deposits. These are the main parameters that determine the choice of intensity used during a session of power and frequency. In reality, namely power and frequency are usually a criteria by which to evaluate existing equipment on the market, while not forgetting about such parameters such as: type and size of single or complex handles, especially emitted ultrasounds, possible presence of a source of local cooling, an influence on the thermal effect of ultrasound.