What does the CT scan’s term "window level" refer to?

The term "window level" in the context of a CT scan refers to the specific Hounsfield unit value at which the center of an image is set. This allows for optimal visualization of certain tissues or structures within the body by adjusting the brightness of the pixels in the image. By setting a window level, radiologists can enhance the contrast of specific types of tissue and obtain clearer images.

In CT imaging, alongside the window level, there's also the concept of "window width," which defines the range of Hounsfield units that will be displayed. Together, these settings allow for tailored imaging that can accentuate different tissue types, such as distinguishing between fat, soft tissue, and bone. Understanding window level is fundamental for interpreting CT images, as it directly affects how structures within the body are visualized.