Which types of tissues have the highest absorption of ultrasound waves?

High collagen and protein content tissues have the highest absorption of ultrasound waves due to their dense structure and molecular organization. Collagen, which is prevalent in connective tissues such as tendons, ligaments, and fascia, has a high acoustic impedance. This means that these tissues can effectively convert ultrasound energy into heat, leading to greater absorption. The protein content also enhances the interaction of the ultrasound waves with the tissue, causing more energy to be retained within these structures during ultrasound treatment.

In contrast, fatty tissues, while they can absorb some ultrasound, do not have the same level of absorption as collagen-rich tissues due to their lower density and different molecular structure. Muscle tissues absorb ultrasound energy to a moderate extent, but they do not match the absorption capacity of high collagen and protein content tissues. Fluid-filled cavities, such as cysts or blood vessels, primarily allow ultrasound waves to pass through with minimal absorption, often reflecting or transmitting sound waves rather than absorbing them. Thus, high collagen and protein content tissues stand out as the most effective in absorbing ultrasound waves.