The effects of soft tissue on ultrasound are called which property?

• A. Acoustic proliferation properties
• B. Dynamic effects
• C. Acoustic propagation properties
• D. Biological effects

Answer: (C)

Soft tissues influence ultrasound through acoustic propagation properties. This covers how the speed of sound varies in tissue, how the energy attenuates with depth, and how impedance differences at tissue interfaces cause reflections and refraction. These propagation properties determine how far the beam travels, how the signal weakens with depth, and how interfaces appear on the image. Biological effects refer to tissue interactions like heating or cavitation, while dynamic effects relate to motion or Doppler phenomena, and proliferation is not a standard term in this context.