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A magnetic resonance imaging (MRI) scan is a painless procedure that lasts 15 to 90 minutes, depending on the size of the area being scanned and the number of images being taken.
- Who Can Have One
Magnetic resonance imaging (MRI) is very safe and most...
- Who Can Have One
Magnetic resonance imaging (MRI) is a type of scan that uses strong magnetic fields and radio waves to produce detailed images of the inside of the body. An MRI scanner is a large tube that contains powerful magnets. You lie inside the tube during the scan.
What happens during an MRI scan? What should I expect after an MRI scan? Where can I get more information? References. Contact details. Page last updated: Review due: Information about Magnetic Resonance Imaging (MRI) scans at UCLH.
- Overview
- What is an MRI scan?
- Uses
- Preparation
- During an MRI scan
- After an MRI scan
- Side effects
- Function
- FAQs
A magnetic resonance imaging (MRI) scan uses a strong magnetic field and radio waves to create detailed images of the organs and tissues within the body. MRI can help with viewing injuries, tumors, certain heart problems, and more.
Since its invention, doctors and researchers continue to refine MRI techniques to assist in medical procedures and research. The development of MRI revolutionized medicine.
This article looks specifically at MRI scans, how they work, and how doctors use them.
•MRI scanning is a non-invasive and painless procedure.
•Raymond Damadian created the first MRI full-body scanner, which he nicknamed the Indomitable.
•The cost of a basic MRI scanner starts at $150,000 but can exceed several million dollars.
An MRI scan uses a large magnet, radio waves, and a computer to create a detailed, cross-sectional image of internal organs and structures.
The scanner itself typically resembles a large tube with a table in the middle, allowing the patient to slide in.
The development of the MRI scan represents a huge milestone for the medical world.
Doctors, scientists, and researchers are now able to examine the inside of the human body in high detail using a non-invasive tool.
The following are examples in which an MRI scanner would be used:
•anomalies of the brain and spinal cord
•tumors, cysts, and other anomalies in various parts of the body
•breast cancer screening for women who face a high risk of breast cancer
There is very little preparation required, if any, before an MRI scan.
On arrival at the hospital, doctors may ask the patient to change into a gown. As magnets are used, it is critical that no metal objects are present in the scanner. The doctor will ask the patient to remove any metal jewellery or accessories that might interfere with the machine.
A person will probably be unable to have an MRI if they have any metal inside their body, such as bullets, shrapnel, or other metallic foreign bodies. This can also include medical devices, such as cochlear implants, aneurysm clips, and pacemakers.
Individuals who are anxious or nervous about enclosed spaces should tell their doctor. Often they can be given medication prior to the MRI to help make the procedure more comfortable.
Patients will sometimes receive an injection of intravenous (IV) contrast liquid to improve the visibility of a particular tissue that is relevant to the scan.
The radiologist, a doctor who specializes in medical images, will then talk the individual through the MRI scanning process and answer any questions they may have about the procedure.
Once in the scanner, the MRI technician will communicate with the patient via the intercom to make sure that they are comfortable. They will not start the scan until the patient is ready.
During the scan, it is vital to stay still. Any movement will disrupt the images, much like a camera trying to take a picture of a moving object. Loud clanging noises will come from the scanner. This is perfectly normal. Depending on the images, at times it may be necessary for the person to hold their breath.
After the scan, the radiologist will examine the images to check whether any more are required. If the radiologist is satisfied, the patient can go home.
The radiologist will prepare a report for the requesting doctor. Patients are usually asked to make an appointment with their doctor to discuss the results.
It is extremely rare that a patient will experience side effects from an MRI scan.
However, the contrast dye can cause nausea, headaches, and pain or burning at the point of injection in some people. Allergy to the contrast material is also seldom seen but possible, and can cause hives or itchy eyes. Notify the technician if any adverse reactions occur.
An MRI scanner contains two powerful magnets. These are the most important parts of the equipment.
The human body is largely made of water molecules, which are comprised of hydrogen and oxygen atoms. At the center of each atom lies an even smaller particle called a proton, which serves as a magnet and is sensitive to any magnetic field.
Normally, the water molecules in the body are randomly arranged, but on entering an MRI scanner, the first magnet causes the water molecules to align in one direction, either north or south.
The second magnetic field is then turned on and off in a series of quick pulses, causing each hydrogen atom to change its alignment when switched on and then quickly switch back to its original relaxed state when switched off.
Passing electricity through gradient coils, which also cause the coils to vibrate, creates the magnetic field, causing a knocking sound inside the scanner.
Although the patient cannot feel these changes, the scanner can detect them and, in conjunction with a computer, can create a detailed cross-sectional image for the radiologist.
How long will an MRI scan take?
MRI scans vary from 20 to 60 minutes, depending on what part of the body is being analyzed and how many images are required. If, after the first MRI scan, the images are not clear enough for the radiologist, they may ask the patient to undergo a second scan straight away.
I have braces or filings, should I still undergo the scan?
Although braces and fillings are unaffected by the scan, they may distort certain images. The doctor and technician will discuss this beforehand. The MRI scan may take longer if additional images are required.
Can I move while I am in the MRI tunnel?
It is important to stay as still as possible while in the MRI scanner. Any movement will distort the scanner and, therefore, the images produced will be blurry. In particularly long MRI scans, the MRI technician may allow a short break halfway through the procedure.
MRI stands for magnetic resonance imaging. An MRI scan is a type of test that creates detailed images of the inside of your body. It uses a powerful magnet and radio waves and is often used to diagnose or monitor a condition.
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Sep 2, 2024 · Magnetic resonance imaging (MRI) is a type of scan that uses strong magnetic fields and radio waves to produce detailed images of the inside of the body. An MRI scanner is a large tube that contains powerful magnets. You lie inside the tube during the scan. An MRI scan can be used to examine any part of the body.
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Aug 6, 2023 · What is an MRI scan? How does an MRI scan work? What does an MRI scan involve? What is an MRI scan used for? Preparing for an MRI scan; Side-effects of an MRI scan; What to expect after the MRI scan
