What is Magnetic Resonance (MRI)? What It Is Used For, What Are The Risks

magnetic resonance
emar, mr, mri, or magnetic resonance device

MRI ( Magnetic Resonance Imaging ) or colloquially as the EMA , which produces detailed three dimensional anatomical images without using harmful radiation, is a non-invasive imaging technology.

It is generally used for disease detection, diagnosis and treatment follow-up. It is based on a sophisticated technology that detects (stimulates) and detects the change in the rotational axis direction of protons in the water that make up living tissues.

How does Magnetic Resonance (MRI) work?

A knee order (mri)

In MRIs, very strong magnets are used that produce a strong magnetic field that forces the protons in the body to align in this area. A radio frequency is then delivered to the patient, and when this happens, the protons are stimulated and return from balance by gliding against the gravitational force of the magnetic field.

When the radiofrequency field is turned off, MRI sensors can detect the released energy as the protons are realigned with the magnetic field. The time it takes for the protons to realign with the magnetic field as well as the amount of energy released vary depending on the environment and the chemical nature of the molecules. Based on these magnetic properties, doctors can tell the difference between various types of tissue.

To obtain an MRI image, the patient is placed inside a large magnet. And in order not to blur the image, the patient should remain as motionless as possible.

Contrast agents (usually containing the Gadolinium element) may be administered intravenously (via the vein) to a patient to increase the rate of re-alignment of the protons with the magnetic field during or before MRI. The faster the protons are realigned, the brighter the image will be.


What is MRI used for?

MRI scanners are devices that are particularly suitable for viewing boneless parts or soft tissues of the body. They differ from computed tomography (CT). Because the damaging ionizing radiation of x-rays is not used.

The brain, spinal cord and nerves, as well as muscles, ligaments and tendons appear much clearer than normal X-ray and CT with MRI; therefore, MRI is often used to view knee and shoulder injuries.

Diffusion MRI technology allows us to see unprecedented details of connections in the brain

In the brain, MRI can distinguish between white matter and gray matter. It can also be used to diagnose aneurysms (regional swelling in the vein) and tumors. Since MRI does not use x-rays or other radiation, it is the preferred imaging method especially when frequent imaging is required for diagnosis or treatment in the brain.

However, MRI is more expensive than X-ray imaging or CT scanning.

One type of special MRI is functional Magnetic Resonance Imaging (fMRG). This type is used to observe brain structures and to determine which areas of the brain are “activated” (consuming more oxygen) during various cognitive tasks.

It is used to improve understanding in brain functioning. And it offers a potential new standard to assess neurological status and neurosurgical (related to nervous system surgery) risk.

Are There Magnetic Resonance Risks?

what is magnetic resonance
New open magnetic resonance imaging (MRI) device

Although MRI does not emit harmful ionizing radiation found in x-ray and CT imaging, it uses a strong magnetic field.

The magnetic field extends out of the machine and exerts very strong forces on iron objects, some steels and other magnetizable objects; strong enough to throw a wheelchair from there in the room. Patients should inform their doctor about any medications or implants before MR scanning.

When entering an MRI (emar) scan, the following should be considered:

    • People with implants should not enter an MRI machine – especially iron-containing pacemakers, vagus nerve stimulators, implantable cardioverter defibrillators, loop recorders, insulin pumps, cochlear implants, deep brain stimulators, and capsule endoscopy capsules.
      What is Magnetic Resonance (MRI)? What It Is Used For, What Are The Risks.
    • Noise – as well as loud sound, often referred to as click and beep sounds, this may require special ear protection in situations where the intensity rises up to 120 decibels in certain MR scanners.
  • Nerve Stimulation – sometimes a feeling of twitching occurs due to rapidly changing areas on the MRI.
  • Contrast agents – patients with severe renal impairment who need dialysis may face a rare but serious risk of disease, which may be due to the use of substances such as Gadodiamide containing Gadolinium and other derivatives called nephrogenic systemic fibrosis. Although no causal link has been established, current guidelines in the United States suggest that dialysis patients should take gadolinium substances only when necessary, and dialysis should be done as soon as possible to promptly remove the substance from the body after screening.
  • Pregnancy – Although there is no effect on the fetus, it is recommended to avoid MRI scans as a precaution, especially during the period when the organs of the fetus are formed and, if used, contrast agents can enter the fetal blood circulation, especially in the first trimester of pregnancy.
  • Claustrophobia – even for people with mild claustrophobia, it can be difficult to withstand long scan times inside the machine. Methods such as meeting with machine and process, visualization techniques, sedation and anesthesia help patients to overcome their ailments. Ways to overcome the process include listening to music or watching videos or movies, closing eyes, and holding a panic button.
    New open magnetic resonance imaging (MRI) device

    Open MRI is a machine that is open from the sides instead of a closed tube at one end. Therefore, it does not completely surround the patient. It has been developed to meet the needs of patients who are uncomfortable with the narrow tunnel and sounds of traditional MRI and patients with enough body size or weight to make conventional MRI unusable. More recent open MRI technology provides high quality for many images, but not for all types of exams.

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