Which imaging modality uses ionizing radiation to produce images of internal structures?

The imaging modality that uses ionizing radiation to produce images of internal structures is X-ray. X-rays work by passing a controlled amount of radiation through the body, which is then captured on a film or digital recording device to create a two-dimensional image of the internal anatomy. This approach is widely used for diagnosing conditions in various body parts, such as bones, lungs, and certain soft tissues.

While CT scans also use ionizing radiation to create detailed cross-sectional images of the body's internal structures, X-rays are the fundamental method of utilizing ionizing radiation for imaging. Ultrasound, on the other hand, utilizes sound waves to create images and does not involve ionizing radiation. MRI employs strong magnetic fields and radio waves to generate images, avoiding ionizing radiation altogether.