What does the term "wedged effect" refer to?

The term "wedged effect" specifically refers to the resultant beam shape created when a wedge is used in radiation therapy. Wedges are devices employed in treatment planning to modify the intensity profile of the radiation beam. By placing a wedge filter in the path of the radiation, clinicians can create a gradient of radiation dose, allowing for a more uniform dose distribution across the treatment area. This effect is particularly valuable when dealing with areas of the body that are not planar or uniform in shape, as it helps to ensure that tissues receive the appropriate dose while minimizing exposure to surrounding healthy tissues. In this context, the wedge alters the beam's geometry and dose distribution, directly impacting treatment outcomes.