Which statement correctly describes the energy localization on the sound head?

Which statement correctly describes the energy localization on the sound head?

• A. Middle
• B. Front
• C. Back
• D. Edge

Answer: (A)

Therapeutic ultrasound delivers the most energy at the center of the sound head. The active crystal or array emits waves most strongly from the middle, producing a beam with the highest intensity there. As the waves diverge and interact toward the edges, energy density decreases due to edge effects and less constructive overlap. That means the center (middle) of the transducer delivers the peak energy, while the edges deliver less. Clinically, this is why you align the target tissue under the middle of the head to maximize energy delivery.

Therapeutic ultrasound delivers the most energy at the center of the sound head. The active crystal or array emits waves most strongly from the middle, producing a beam with the highest intensity there. As the waves diverge and interact toward the edges, energy density decreases due to edge effects and less constructive overlap. That means the center (middle) of the transducer delivers the peak energy, while the edges deliver less. Clinically, this is why you align the target tissue under the middle of the head to maximize energy delivery.