Periosteal pain during ultrasound exposure typically indicates:

Periosteal pain during ultrasound exposure typically indicates:

• A. Too much concentration burning bone
• B. Cooling of tissue
• C. Insufficient coupling
• D. Excessive hydration

Answer: (A)

Periosteal pain during ultrasound shows that energy is being concentrated at the bone surface, heating the periosteum. Bone absorbs ultrasound more readily than soft tissue, and the periosteum has many pain receptors, so heating here feels sharp and localized. This pain is a warning to reduce energy, adjust the duty cycle, or move away from the bone rather than continuing at the same level. Cooling of tissue wouldn’t cause this pain, insufficient coupling would mainly reduce transmission and the intended effect, and excessive hydration isn’t a typical driver of periosteal pain.

Periosteal pain during ultrasound shows that energy is being concentrated at the bone surface, heating the periosteum. Bone absorbs ultrasound more readily than soft tissue, and the periosteum has many pain receptors, so heating here feels sharp and localized. This pain is a warning to reduce energy, adjust the duty cycle, or move away from the bone rather than continuing at the same level. Cooling of tissue wouldn’t cause this pain, insufficient coupling would mainly reduce transmission and the intended effect, and excessive hydration isn’t a typical driver of periosteal pain.