Mri scan

MRI Scan

An MRI scan or Magnetic Resonance Imaging scan is a radiologic technique used in medicine to visualize the structure and function of the body. It uses a large magnet and radio waves to generate signals from atoms in the body. These signals are then used to construct images of internal structures.

History

The development of MRI technology began in the early 20th century with the discovery of nuclear magnetic resonance (NMR). However, it was not until the late 1970s and early 1980s that the first MRI scans of the human body were performed.

Principles

MRI scans work on the principle of nuclear magnetic resonance. Specifically, an MRI scanner excites hydrogen atoms in water molecules in the body, causing them to emit a radio signal. This signal is then detected by the scanner and used to construct an image.

Procedure

During an MRI scan, the patient lies on a table that slides into a large, cylindrical machine. The machine generates a strong magnetic field around the patient, and radio waves are sent into the body. The radio waves cause the hydrogen atoms in the body to emit signals, which are detected by the scanner and used to create images.

Uses

MRI scans are used in a variety of medical contexts. They are particularly useful for imaging soft tissues and organs like the brain, spinal cord, muscles, and heart. They can be used to diagnose a variety of conditions, such as tumors, strokes, and joint injuries.

Risks and Contraindications

While MRI scans are generally safe, they do carry some risks. These include the potential for an allergic reaction to contrast material, damage to tissues from the heat generated by the MRI, and the risk of a metal object being moved by the MRI's magnetic field.

See Also

• Computed Tomography
• Radiology
• Nuclear Magnetic Resonance

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