What term refers to attenuation occurring with each centimeter that sound travels?

What term refers to attenuation occurring with each centimeter that sound travels?

• A. Attenuation coefficient
• B. Attenuation
• C. Circumference
• D. Compression

Answer: (A)

Attenuation coefficient describes how much the ultrasound signal loses per centimeter of tissue for a given frequency. It’s the rate of attenuation with distance, so with each extra centimeter traveled, the strength of the signal decreases by an amount set by this coefficient. Since it’s usually expressed in dB per centimeter, multiplying by the distance yields the total attenuation for that path. This is different from general attenuation, which is the overall loss, and it’s different from circumference or compression, which are unrelated terms in this context. In soft tissue, the coefficient is about 0.5 dB/cm/MHz, so higher frequencies have larger coefficients and attenuate more quickly.

Attenuation coefficient describes how much the ultrasound signal loses per centimeter of tissue for a given frequency. It’s the rate of attenuation with distance, so with each extra centimeter traveled, the strength of the signal decreases by an amount set by this coefficient. Since it’s usually expressed in dB per centimeter, multiplying by the distance yields the total attenuation for that path. This is different from general attenuation, which is the overall loss, and it’s different from circumference or compression, which are unrelated terms in this context. In soft tissue, the coefficient is about 0.5 dB/cm/MHz, so higher frequencies have larger coefficients and attenuate more quickly.