What describes cavitation in the context of ultra sound therapy?

Cavitation in the context of ultrasound therapy refers to the process involving the formation of gas-filled bubbles in a liquid medium, which then undergo cycles of expansion and compression. This phenomenon occurs when ultrasound waves pass through tissues, resulting in localized pressure changes that can cause the bubbles to grow and shrink rapidly.

Cavitation is significant in therapeutic applications as it can enhance the effects of ultrasound treatments, aiding in tissue repair, and improving the delivery of medication. The behavior of these bubbles and the forces they generate can contribute to various biological effects, making this process a key concept in understanding how ultrasound therapy functions effectively in clinical settings. The other options do not accurately describe the specific characteristics and behavior of cavitation relevant to ultrasound therapy.