Which imaging modality uses ionizing radiation to produce images of the body's internal structures?

The imaging modality that utilizes ionizing radiation to produce images of the body's internal structures is the X-ray. X-rays work by directing a controlled beam of radiation through the body, which is absorbed by different tissues to varying degrees. Dense tissues, such as bones, absorb more radiation and appear white on the X-ray film, while softer tissues absorb less and appear darker.

In the context of the question, it's important to note that both CT scans and X-rays involve ionizing radiation, but the question asks for a single modality. While CT scan technology does encompass X-ray principles, it combines multiple images taken from different angles to generate cross-sectional views of the body. Ultrasound and MRI, on the other hand, do not utilize ionizing radiation; ultrasound relies on sound waves, and MRI uses strong magnetic fields and radio waves to create detailed images of soft tissues. Therefore, the definitive answer highlighting a specific modality producing images through the use of ionizing radiation is the X-ray.