Which imaging technique uses ionizing radiation to create detailed images of the human body?

X-ray imaging is the correct choice because it utilizes ionizing radiation to produce images of the body's internal structures. This technique works by passing a controlled amount of radiation through the body, which is then absorbed differently by various tissues. Dense tissues, such as bones, absorb more radiation and appear white on the X-ray film, while softer tissues appear in shades of gray, allowing for the visualization of structures within the body.

In contrast, ultrasound imaging relies on sound waves rather than ionizing radiation to create images, making it safer for certain applications, especially during pregnancy. MRI (Magnetic Resonance Imaging) involves the use of strong magnetic fields and radio waves to generate detailed images of organs and tissues without ionizing radiation, thus providing a different imaging modality. CT (Computed Tomography) imaging also employs ionizing radiation but provides a different approach by taking multiple X-ray images from various angles and reconstructing them to create cross-sectional views of the body.

Thus, while both X-ray and CT imaging utilize ionizing radiation, the specific context of the question emphasizes X-ray imaging as a fundamental technique known for its direct application in producing images using this form of radiation.