With a coarse interface, how much of the reflected sound is typically scattered?

When evaluating the interaction of ultrasound with a coarse interface, it's essential to understand how sound waves behave upon encountering different tissue structures. In the case of a coarse interface, which refers to a surface with significant irregularities or variations in texture, the reflected sound waves tend to scatter extensively.

This scattering occurs because the irregularities cause the sound waves to deviate from their primary direction of travel, leading to a greater amount of energy being redirected in multiple directions. As a result, a large portion of the reflected sound is scattered instead of being coherently directed back to the transducer. This extensive scattering can impact the quality of the ultrasound image and is crucial for interpreting the data accurately in clinical settings.

In summary, when an ultrasound beam encounters a coarse interface, the substantial scattering of sound waves leads to a large portion of the reflected sound being dispersed, which is why this is the most accurate response to the question.