Which type of medical imaging uses electromagnetic radiation?

Radiography is a medical imaging technique that utilizes electromagnetic radiation, specifically X-rays, to create images of the internal structures of the body. This method works by passing X-rays through the body, where different tissues absorb varying amounts of radiation. As a result, denser materials like bones appear white on the radiographic image, while softer tissues appear in shades of gray, allowing for visualization and diagnosis of various conditions.

Ultrasound, on the other hand, relies on sound waves rather than electromagnetic radiation to produce images, while MRI uses a strong magnetic field and radio waves to generate images of organs and tissues. Computed Tomography (CT) does use X-rays, similar to radiography, but it employs multiple X-ray images taken from different angles and processes them with a computer to create cross-sectional images or "slices" of the body. While both Radiography and CT involve X-rays, the question asks specifically about the type that uses electromagnetic radiation exclusively without the added complexity of computer processing that defines CT.