Magnetic Resonance Imaging (MRI)
Magnetic resonance imaging (MRI) is a type of scan that uses strong magnetic fields and radio waves to produce a detailed image of the inside of the body. It is often used for disease detection and to diagnose or monitor the treatment of various conditions within the body.
How does MRI work?
MRIs use powerful magnets which produce a strong magnetic field that forces protons in the body to align with that magnetic field. When radiofrequency current pulses through the patient, the protons stimulate and spin out of equilibrium. Also, when a radiofrequency turns off, the sensors can detect the energy released as protons realign within the field.
For obtaining an MRI image, a patient is placed inside a large magnet and must remain until the process is not complete. The faster the protons realign with the magnetic field, the brighter the image you will get.
Uses of MRI
MRI scanners are well suites for images of the body. They differ from computed tomography because they do not use the damaging ionizing radiation of x-rays. Body parts like the brain, spinal cord, muscles, and ligaments are seen much more clearly with MRI than with x-rays and CT.
MRI can differentiate between white and grey matter in the brain. It can use to diagnose brain tumors because it does not use x-ray or other radiations. Hence, MRI is more expensive than x-ray or CT scan.
One of the specialized MRIs is functional Magnetic Resonance Imaging (fMRI). It is use to observe brain structure and determine which area of the brain is active during the task. Furthermore, it also advances the understanding of brain organization.
Is there any risk in MRI?
As it does not emit the ionizing radiations, that emits by x-rays or CT scans. So, it does not employ a magnetic field.
When having an MRI scan, the following things take into consideration.
- People with implants, particularly those containing iron should not enter an MRI machine.
- The sound intensity of MR scanners is up to 120 decibels, which requires special ear protection.
- During pregnancy, it suggests that MR scans shun as a precaution, especially in the first quarter of pregnancy.
- You might feel a twitching sensation. This is happen because the scan stimulates the nerves of the body.
- people with claustrophobia might take it difficult to stay for a long time in the machine.
- People should remove the contrast agents after the scan.