What term describes a substance that is transparent to X-rays?

The term that describes a substance that is transparent to X-rays is radiolucent. Radiolucent materials allow X-rays to pass through them, resulting in a darker appearance on radiographic images. This property is essential in medical imaging as it helps in the visualization of internal structures without the interference of the material itself. For example, soft tissues and fluids in the body are typically radiolucent, allowing for clear imaging of bones and organs.

In contrast, materials that are not transparent to X-rays, which would block the X-rays and appear white or light on the radiograph, are referred to as radiopaque. This distinction is crucial in diagnostic imaging to effectively differentiate between different types of tissues and structures within the body. Understanding these terms helps healthcare professionals analyze imaging results accurately and make informed decisions regarding patient care.