Attenuation is extremely low in which medium?

Attenuation is extremely low in which medium?

• A. Air
• B. Water
• C. Blood
• D. Fat

Answer: (B)

Attenuation is the loss of ultrasound energy as it travels through a medium, caused by absorption and scattering, and it depends on the medium’s properties and the frequency used. Water has extremely low absorption at diagnostic ultrasound frequencies, so the energy decreases very little as it passes through, making attenuation minimal. In contrast, air causes a large impedance mismatch and strong reflections, while fat and blood absorb and scatter more energy than water, leading to greater attenuation. So, among the given media, attenuation is extremely low in water.

Attenuation is the loss of ultrasound energy as it travels through a medium, caused by absorption and scattering, and it depends on the medium’s properties and the frequency used. Water has extremely low absorption at diagnostic ultrasound frequencies, so the energy decreases very little as it passes through, making attenuation minimal. In contrast, air causes a large impedance mismatch and strong reflections, while fat and blood absorb and scatter more energy than water, leading to greater attenuation. So, among the given media, attenuation is extremely low in water.