Answer #49

The correction answer is C: Refraction is not a form of attenuation. Both refraction, reflection (Choice B) and also absorption are all forms of attenuation.

Because reflection is fundamental to diagnostic ultrasound, and it is form of attenuation, modern diagnostic ultrasound does indeed rely in part of attenuation, making Choice A incorrect. Choice D basically defines attenuation and is true, so it is not the correct answer.