If the transducer is moved closer to the tissue, the intensity is:

If the transducer is moved closer to the tissue, the intensity is:

• A. Higher intensity
• B. Lower intensity
• C. No change
• D. More even heating

Answer: (B)

Moving the transducer closer to tissue changes how the beam is spread before it reaches the tissue. When you’re nearer, the beam has less geometric spreading, so the power is distributed over a smaller area at the tissue surface. With roughly the same emitted power, that smaller area means a higher intensity at the tissue. Attenuation along the path also plays a role, but the immediate effect of reduced spreading is to increase intensity. So, the closest answer is higher intensity. Lower intensity would occur if the beam were spread out more, and the idea of more even heating isn’t guaranteed simply by moving closer, since peak intensity tends to increase while the distribution can become less uniform depending on the beam geometry and focusing.

Moving the transducer closer to tissue changes how the beam is spread before it reaches the tissue. When you’re nearer, the beam has less geometric spreading, so the power is distributed over a smaller area at the tissue surface. With roughly the same emitted power, that smaller area means a higher intensity at the tissue. Attenuation along the path also plays a role, but the immediate effect of reduced spreading is to increase intensity.

So, the closest answer is higher intensity. Lower intensity would occur if the beam were spread out more, and the idea of more even heating isn’t guaranteed simply by moving closer, since peak intensity tends to increase while the distribution can become less uniform depending on the beam geometry and focusing.