Which processes contribute to attenuation?

Which processes contribute to attenuation?

• A. Reflection
• B. Absorption
• C. Scattering
• D. Reflection, Scattering, and Absorption

Answer: (D)

Attenuation is the loss of ultrasound intensity as it travels through tissue. This happens because energy is removed from the forward beam by three processes: absorption, where acoustic energy is converted to heat; scattering, where energy is redirected out of the forward path in many directions; and reflection, where part of the energy is sent back toward the transducer or elsewhere at interfaces with impedance mismatches. Since each of these mechanisms takes energy out of the forward direction, their combined effect is the attenuation of the transmitted beam. That’s why Reflection, Scattering, and Absorption together best describe attenuation.

Attenuation is the loss of ultrasound intensity as it travels through tissue. This happens because energy is removed from the forward beam by three processes: absorption, where acoustic energy is converted to heat; scattering, where energy is redirected out of the forward path in many directions; and reflection, where part of the energy is sent back toward the transducer or elsewhere at interfaces with impedance mismatches. Since each of these mechanisms takes energy out of the forward direction, their combined effect is the attenuation of the transmitted beam. That’s why Reflection, Scattering, and Absorption together best describe attenuation.