Which of the following imaging techniques involves the use of magnetic resonance?

Magnetic Resonance Imaging (MRI) is the imaging technique that utilizes magnetic resonance. It employs powerful magnets and radio waves to generate detailed images of the organs and tissues within the body. Unlike X-ray and Computed Tomography (CT), which primarily use ionizing radiation to create images, MRI relies on the magnetic properties of hydrogen atoms in the body. When a patient is placed in the MRI scanner, the magnetic field causes these hydrogen atoms to align. A radiofrequency pulse then temporarily displaces the alignment of the atoms, and as they return to their original state, they emit signals that are detected and converted into images. This technique is particularly effective for imaging soft tissues, making it invaluable in neurological, musculoskeletal, and oncological applications.

The other imaging techniques listed do not use magnetic resonance. X-ray and CT scans rely on ionizing radiation to visualize internal structures, while ultrasound employs high-frequency sound waves to produce images, making them distinct from MRI in terms of technology and applications.