What does the concept of "collimation" refer to in ultrasound therapy?

Collimation in ultrasound therapy refers to the process of focusing the ultrasound beam. This technique is essential because it allows the ultrasound waves to be directed accurately to the specific area being treated, improving the effectiveness of the therapy. By focusing the beam, the clinician can ensure that the therapeutic energy is delivered to the desired tissues while minimizing exposure and potential effects on surrounding structures. Precise collimation can enhance treatment outcomes and reduces the risk of adverse effects on adjacent tissues.

The other options describe aspects of ultrasound therapy but do not capture the essence of collimation. The duration of treatment sessions, increasing the intensity of sound waves, and calibrating devices are all important aspects of ultrasound therapy but do not specifically pertain to focusing the ultrasound beam.