In radiology, what does the term "density" refer to?

In the context of radiology, "density" specifically refers to the amount of radiation absorbed by the tissues being imaged. When x-rays are transmitted through the body, different types of tissues absorb varying amounts of radiation based on their composition and density. For example, denser tissues like bone will absorb more x-rays, resulting in a lighter appearance on the radiographic image, while less dense tissues, such as muscles or fat, absorb fewer x-rays and appear darker.

This concept of density is crucial for interpreting radiographic images because it helps radiologists differentiate between various types of tissue and identify abnormalities or lesions based on how much radiation they absorb. Understanding tissue density is essential for accurate diagnosis and effective treatment planning in radiology.