MRI stands for "magnetic resonance imaging." An MRI is used in the medical field and provides a strong contrast of soft tissues that most medical equipment like a CT or X-ray cannot provide. A strong and expensive magnet is used to scan the body's healthy and diseased tissue. These machines may cost in the millions and will have varied strengths depending on the medical need for the scan.
History
The first MRI was used on a human in 1977, making this technology one of the newest in medical imagery.
Function
Since the body is made mostly of water, the magnetic field created by the MRI scans the protons and hydrogen nuclei of the body's water molecules with the direction of the magnetic field. The protons then absorb the energy of a second radiofrequency electromagnetic and releases a radiofrequency which can be detected by the MRI's scanner.
Considerations
Consider using an "open MRI" if you have a fear of closed spaces or are very overweight. The magnetic imaging is not as strong, but you will have more room to breath in the close quarters.
Benefits
MRI can diagnose conditions including cancer, vascular disease and other internal abnormalities. The MRI can view diseased tissues that may be hidden from bones. Sick tissues such as tumors are identified as the protons scanned return to their equilibrium at a different rate than healthy tissue.
Warning
Alert your medical professional if you have any metal objects embedded in your body or are pregnant. If sedation is used, there is a chance of over sedation and a risk to your breathing abilities. Some patients have reported an allergic reaction to the injected contrast fluid. Alert your medical professional if you have severe headaches, itching or other allergic symptoms.
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