Which statement describes transmission of energy in tissue?

Which statement describes transmission of energy in tissue?

• A. Energy absorbed at the surface
• B. Energy reflected away entirely
• C. Energy not reflected or absorbed passes to the next layer
• D. Energy is converted to electrical energy

Answer: (C)

Transmission through tissue means the portion of energy that continues beyond a tissue layer after accounting for reflection and absorption. In practice, when ultrasound reaches an interface, some energy is reflected back, some is absorbed by the tissue (often warming it), and the remaining energy is transmitted to the next deeper layer. The statement that energy not reflected or absorbed passes to the next layer captures this idea of transmission precisely. Absorption at the surface would stop energy there, so that isn’t transmission. Energy reflected away entirely means nothing is transmitted. Energy being converted to electrical energy isn’t describing how energy moves through tissue; it relates to how the transducer or piezoelectric material works, not the tissue’s transmission of energy.

Transmission through tissue means the portion of energy that continues beyond a tissue layer after accounting for reflection and absorption. In practice, when ultrasound reaches an interface, some energy is reflected back, some is absorbed by the tissue (often warming it), and the remaining energy is transmitted to the next deeper layer. The statement that energy not reflected or absorbed passes to the next layer captures this idea of transmission precisely.

Absorption at the surface would stop energy there, so that isn’t transmission. Energy reflected away entirely means nothing is transmitted. Energy being converted to electrical energy isn’t describing how energy moves through tissue; it relates to how the transducer or piezoelectric material works, not the tissue’s transmission of energy.