Explain the term "cavitation" in the context of Sonic ultrasound therapy.

Cavitation, in the context of Sonic ultrasound therapy, specifically refers to the formation and collapse of microbubbles within tissues. This process occurs when ultrasound waves pass through a medium, leading to rapid pressure changes. During these changes, microbubbles form in the tissue fluids and subsequently collapse, creating high-energy shockwaves. This collapse can produce localized mechanical forces that enhance the therapeutic effects of ultrasound treatment, such as increased tissue permeability, improved circulation, and accelerated healing.

This phenomenon is essential in therapeutic applications as it can facilitate drug delivery, enhance tissue regeneration, and promote pain relief. The mechanical action produced by cavitation leads to a more effective treatment outcome compared to ultrasound therapy without cavitation, making it a key aspect of utilizing ultrasound in medical therapies.