MRI scans of the brain or chest areas don’t usually require any special dietary preparation. For others you may be asked to drink a certain amount of water before the test. Can I eat or drink before an MRI?įor some scans, such as scans of the abdomen and pelvis, you may be asked to restrict food and drink for a few hours before the test. You will also be asked to not wear any makeup or hairspray on the day of the scan, as these products may contain tiny metallic particles that could lead to problems with the scan.
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Tattooed skin may feel slightly warm during the scan. Some tattoos contain traces of metal, but it is usually still safe to have an MRI. Some wigs contain traces of metal, so these also need to be removed.
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You will be asked to remove all jewellery, watches, and hearing aids, and to take out any removable dental work.
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This allows the scanner to tell the difference between different tissue types and detect damaged or diseased tissue. Diseased tissue also gives off a different signal from healthy tissue. Because the hydrogen atoms in different types of body tissue realign at different speeds, they produce different signals. Hydrogen atoms are found in water – H2O – and our bodies have a high composition of water, meaning hydrogen is found throughout the body. The signals are transmitted to radio antennae, or receivers, and the computer picks up this information and generates images. When the radio waves are turned off, the atoms realign, and as they do so they produce radio signals. Radio waves are then passed into the part of your body being scanned, moving the hydrogen atoms out of alignment. The strong magnets in the MRI scanner create a magnetic field, which causes the hydrogen atoms in your body to line up in the same direction. MRI can sometimes show conditions or details that other imaging tests cannot provide. MRI is often used in addition to other tests, including other imaging tests such as ultrasound. It is also useful in assessing knee injuries and other sports injuries as it is good at showing problems with soft tissues such as muscles, tendons and ligaments. MRI is often recommended for imaging the brain and spine because of the detailed, high-quality images it provides. MRI is used when it is considered to be the best test to help diagnose or assess your condition, or when simpler and less expensive tests have failed to give a diagnosis. MRI scans can provide detailed pictures of any part of the body. Instead of using X-rays, MRI uses strong magnets, low-energy radio waves and a computer to produce images.
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An MRI (magnetic resonance imaging) scan is an imaging test that can give very detailed images of the inside of the body.