Bone absorption during ultrasound exposure is listed to occur in which structure among the following?

• A. Tendon
• B. Muscle
• C. Nerve
• D. Skin

Answer: (A)

Ultrasound energy is absorbed differently by tissues, and this absorption largely determines how much heating occurs. Tendon is a dense, collagen-rich structure, so it absorbs more energy and converts more of it to heat than muscle, nerve, or skin. That makes tendon the structure among these options with the highest ultrasound absorption. If bone were an option, it would absorb even more, but among the given choices, tendon shows the greatest absorption.