magneettikuvausmenetelmään

Magneettikuvausmenetelmä, commonly known as magneettikuvaus or MRI (Magnetic Resonance Imaging) in English, is a non-invasive medical imaging technique used to visualize internal structures of the body. It utilizes strong magnetic fields and radio waves to produce detailed images of organs, tissues, bone, and other internal body structures. Unlike X-rays or CT scans, MRI does not involve ionizing radiation.

The process begins by placing the patient within a powerful magnetic field. This field aligns the protons within the body's water molecules. Subsequently, short bursts of radiofrequency waves are applied, which knock these aligned protons out of equilibrium. When the radiofrequency pulses are turned off, the protons realign with the magnetic field, releasing energy in the form of radio signals. These signals are detected by the MRI scanner and processed by a computer to create cross-sectional images. Different tissues emit different signals based on their water content and molecular environment, allowing for differentiation between them.

MRI is particularly valuable for imaging soft tissues such as the brain, spinal cord, muscles, ligaments, and internal organs. It plays a crucial role in diagnosing a wide range of conditions, including tumors, neurological disorders like multiple sclerosis and stroke, joint injuries, and cardiovascular diseases. The ability to obtain images in multiple planes without repositioning the patient enhances its diagnostic utility. While generally safe, MRI is contraindicated for individuals with certain metallic implants, such as pacemakers or specific types of surgical clips, due to the strong magnetic field. The procedure is typically painless, although some patients may experience claustrophobia within the scanner and may opt for open MRI scanners.