An MRI (Magnetic Resonance Imaging) is done by using a powerful magnet and radio waves to create detailed images of the organs and tissues in your body. Here's a breakdown of the process:
1. Preparation:
- You will likely be asked to change into a gown and remove any metal objects, such as jewelry, watches, or piercings, as these can interfere with the magnetic field.
- You may be asked about any medical implants you have, such as pacemakers or metal implants, as these can pose a risk during the MRI.
- In some cases, a contrast dye may be injected intravenously to enhance the visibility of certain tissues or blood vessels.
2. Positioning:
- You will lie on a table that slides into a large, tunnel-shaped MRI scanner.
- Depending on the area being scanned, you may lie on your back, stomach, or side.
- Pillows or straps may be used to help you stay still and comfortable.
3. The Scan:
- Once you are inside the scanner, the MRI machine will generate a strong magnetic field. This aligns the protons in your body.
- Short bursts of radio waves are then emitted, which temporarily knock the protons out of alignment.
- As the protons realign, they emit signals that are detected by the MRI machine.
- These signals are used to create detailed cross-sectional images of the body.
- The process is typically repeated multiple times to capture images from different angles.
4. Noise:
- During the scan, you will hear loud knocking or thumping sounds. This is normal and is caused by the gradient magnets turning on and off. Earplugs or headphones are usually provided to help reduce the noise.
5. Communication:
- You will be able to communicate with the technician performing the scan through an intercom system.
- You should let the technician know if you are feeling uncomfortable or claustrophobic.
In Summary: An MRI uses strong magnets and radio waves to generate detailed images of your body's internal structures. The process involves lying still inside a scanner while the machine emits these magnetic and radio wave pulses. The signals produced are then processed to create cross-sectional images.
