Ultrasound gel is a conductive medium that creates a bond between the skin and the ultrasound transducer.
A gel is used on all surfaces of the head to reduce friction and assist transmission of the ultrasonic waves. Therapeutic ultrasound in physical therapy is alternating compression and rarefaction of sound waves with a frequency of 0.7 to 3.3 MHz.
Maximum energy absorption in soft tissue occurs from 2 to 5 cm.
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