What is the recommended treatment area size relative to the transducer?

What is the recommended treatment area size relative to the transducer?

• A. 2-3 times the size of the transducer
• B. The same size as the transducer
• C. Half the size of the transducer
• D. Four times the size of the transducer

Answer: (A)

In ultrasound therapy, energy distribution matters: the beam is strongest at the center and tapers toward the edges, so treating a field that’s about two to three times the transducer size helps ensure the tissue receives even heating. If the treated area is as small as the transducer, the energy becomes too concentrated in a small spot, raising the risk of hotspots. If the area is much larger, the intensity at the edges drops and heating may be insufficient. Therefore, using a treatment area roughly two to three times the transducer size provides effective, uniform heating while minimizing hot spots.

In ultrasound therapy, energy distribution matters: the beam is strongest at the center and tapers toward the edges, so treating a field that’s about two to three times the transducer size helps ensure the tissue receives even heating. If the treated area is as small as the transducer, the energy becomes too concentrated in a small spot, raising the risk of hotspots. If the area is much larger, the intensity at the edges drops and heating may be insufficient. Therefore, using a treatment area roughly two to three times the transducer size provides effective, uniform heating while minimizing hot spots.