Before we begin: Magnetic resonance imaging (MRI) uses a large magnet and radio waves to look at organs and structures inside the body. Read about the use of MRI scan.
This tutorial walks you through everything you need to know about mri scans. We explain it in plain language, step by step, so whether you are a student, a patient, or simply curious, you will come away with a solid understanding.
We cover what it is, why it matters, how it is diagnosed, and what you can do about it. Key facts are called out along the way.
What is an MRI scan?
Magnetic resonance imaging (MRI) is an imaging test that is usually painless and uses magnets, radio waves, and a computer to create detailed pictures of the inside of your body. MRI scans show organs and soft tissues clearly and can help tell healthy from unhealthy tissue in many cases.
Who needs an MRI scan? MRI scans are often used to diagnose conditions that affect soft tissues and to monitor treatment.
MRI may be used to look at:
The brain, spinal cord, and nerves
Muscles, ligaments, and tendons
Joints, such as the knee or shoulder
MRI does not use x-rays or other radiation. Because of this, it may be used when repeat imaging is needed.
How do you prepare for an MRI scan? MRI machines use powerful magnets. Metal objects or implants can interfere with the scan and may be unsafe.
Before your MRI, you will need to remove items such as:
Jewelry and watches
Hairpins
Hearing aids
Before your MRI, tell your health care provider if you:
Are pregnant
Are breastfeeding, especially if you may receive contrast material (a substance that helps some parts of your body show up more clearly on the images)
Feel anxious in enclosed spaces (claustrophobic)
Have kidney problems
Have metal in your body, such as bullets, shrapnel, or other metal fragments
Have metal or electronic devices in your body, such as a pacemaker, artificial joint, or other implants
Have tattoos or permanent makeup, since some darker inks may contain metal
How is an MRI scan done? You will usually change into a hospital gown. Sometimes before the test, you may receive contrast, which is usually given through a vein (intravenously or IV).
During the scan, you lie on a table that slides inside a large, tunnel-like machine. Some facilities use an open MRI machine, which is less enclosed. The machine makes loud noises as it takes pictures. You may be given earplugs or headphones.
The scan can take some time, depending on the part of your body being examined. You will need to stay very still during the scan.
What should I expect after an MRI scan? After most MRI scans, you can return to normal activities right away. If you were given medicine to help you relax, someone will need to take you home.
A specialist called a radiologist reviews the images and shares them with your provider.
Also known as: Magnetic resonance imaging, NMR, Nuclear magnetic resonance.
Related topics: Magnetic Resonance Imaging.
Categories: Diagnostic Tests.
Key Takeaways
Understanding mri scans is an important part of taking charge of your health. Here is what to remember:
- Know the signs — Recognizing early symptoms can lead to earlier diagnosis and better outcomes.
- Talk to your provider — If you have concerns or a family history of this condition, bring it up at your next checkup.
- Stay informed — Medical knowledge evolves. Keep learning and asking questions.
- You are not alone — Many people deal with this condition. Support groups and educational resources can help.