Structures that absorb x-rays are termed?

Structures that absorb X-rays are classified as radiopaque. This term refers to materials that do not allow X-rays to pass through easily, resulting in these structures appearing white or light on radiographic images. Radiopaque materials have a high atomic number, which increases their density and thus their ability to absorb X-rays. This property is crucial in medical imaging because it helps distinguish between different types of tissues and organs based on their X-ray absorption characteristics.

In contrast, radiolucent structures allow X-rays to pass through more readily, appearing darker on images. Radiative and transparent do not pertain to the absorption properties of materials in the context of X-rays, as radiative typically relates to radiation emission, and transparent refers to materials that allow light to pass through without significant absorption or scattering, which is not applicable to X-ray imaging.