True or False: The larger a spot size is, the deeper it penetrates.

The assertion that a larger spot size leads to deeper penetration is correct because larger spot sizes generally distribute the energy over a greater area, which can increase the overall thermal effect in a specific volume of tissue. This allows the laser energy to be absorbed more effectively deeper within the tissue layers.

When a larger spot size is used, the body can absorb more energy without overheating the surface layer, allowing the energy to reach deeper structures. This principle is particularly relevant in laser treatments where the goal is to target deeper tissues, such as in some dermatological or surgical applications.

In contrast, smaller spot sizes tend to concentrate energy on a smaller area, which can cause a more intense effect on the surface, but may not penetrate as deeply into the tissue. Therefore, for applications requiring deeper penetration, a larger spot size is often the preferred choice.

While the properties of the laser itself and the specific tissue being treated can influence penetration depth, generally speaking, larger spot sizes assist in achieving deeper tissue penetration effectively.