What distinguishes a magnetic resonance image (MRI) from an x-ray and computed tomography (CT) scan?

The distinguishing feature of magnetic resonance imaging (MRI) compared to x-rays and computed tomography (CT) scans is that MRIs do not produce ionizing radiation. Instead, MRIs utilize strong magnetic fields and radio waves to generate images of the body's internal structures. This absence of radiation makes MRI a safer option for patients, particularly for repeated imaging and for specific populations such as children or those who may be more sensitive to radiation exposure.

In contrast, both x-rays and CT scans utilize ionizing radiation to create images, which can carry certain risks with repeated exposure. The fact that MRI relies on magnetism rather than radiation highlights an important safety consideration when choosing an imaging modality.

While other aspects of MRI, such as cost, the potential need for sedation, and procedure time can vary, the unique characteristic of not involving radiation is a primary distinguishing factor from x-rays and CT scans.