Radiology Practice Test 2026 – Your All-In-One Guide to Exam Success!

Question: 1 / 400

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

A material that is transparent to X-rays

A material that does not allow X-rays to pass through

The term "radiopaque" specifically refers to a material that does not allow X-rays to pass through. When it is exposed to X-rays, a radiopaque substance absorbs the radiation, appearing white or light on the resulting images. This property is crucial in radiology as it helps to differentiate between various tissues and structures within the body during imaging procedures. For example, barium sulfate is a radiopaque contrast agent used in imaging the gastrointestinal tract because it effectively highlights areas that would otherwise be difficult to see, allowing for better diagnosis and assessment.

In contrast, "radiolucent" materials would allow X-rays to pass through and appear darker on the images, which is important to understand in comparing the visibility of different structures. This distinction is foundational in interpreting radiological images accurately.

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A chemical used in imaging

A term for the process of imaging

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