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Magnetic resonance imaging (MRI) is an advanced imaging procedure that uses magnetic field and pulses of radio wave energy to make pictures of organs and structures inside the body. In many cases, MRI gives different information about structures than can be seen with an X-ray, ultrasound, or computed tomography (CT) scan. MRI also may show problems that cannot be seen with other imaging methods.
At Medicover Hospital we use SIEMENS MAGNETOM Aera MRI scanner for fast and reliable scans and the outmost image quality and resolution.
It is used to investigate the cause of your symptoms and find problems such as tumors, bleeding, injury, blood vessel diseases, or infection. MRI also may be done to provide more information about a problem seen on an X-ray, ultrasound scan, or CT scan. Contrast material may be used during MRI to show abnormal tissue more clearly.
You will need to remove all metal objects (such as hearing aids, dentures, jewelry, watches, and hairpins) from your body because these objects may be attracted to the powerful magnet used for the test.
You will need to take off all or most of your clothes, depending on which area is examined (you may be allowed to keep on your underwear if it is not in the way). You will be given a gown to use during the test. If you are allowed to keep some of your clothes on, you should empty your pockets of any coins and cards (such as credit cards or ATM cards) with scanner strips on them because the MRI magnet may erase the information on the cards.
During the test, you usually lie on your back on a table that is part of the MRI scanner. Your head, chest, and arms may be held with straps to help you remain still. The table will slide into the space that contains the magnet. A device called a coil may be placed over or wrapped around the area to be scanned. A special belt strap may be used to sense your breathing or heartbeat. This triggers the machine to take the scan at the right time.
Some people feel nervous (claustrophobic) inside the MRI magnet. If this keeps you from lying still, you can be given a medicine (sedative) to help you relax. Some MRI machines (called open MRI) are now made so that the magnet does not enclose your entire body. Open MRI machines may be helpful if you are claustrophobic, but they are not available everywhere. The pictures from an open MRI may not be as good as those from a standard MRI machine.
Inside the scanner you will hear a fan and feel air moving. You may also hear tapping or snapping noises as the MRI scans are taken. You may be given earplugs or headphones with music to reduce the noise. It is very important to hold completely still while the scan is being done.
For an MRI test, the area of the body being studied is placed inside a special machine that contains a strong magnet. Pictures from an MRI scan are digital images that can be saved and stored on a computer for more study. The images also can be reviewed remotely, such as in a clinic or an operating room. In some cases, contrast material may be used during the MRI scan to show certain structures more clearly.
Benefits of MRI scan:
Risks of MRI scan:
The magnetic fields generated by the MRI scanner attract metal objects with great force. For this reason patients are instructed to remove all metallic belongings, such as watches, keys and jewellery.
During the scan metal containing objects – like medical implants may – in your body may heat up due to radiofrequency energy that MRI scanner uses.
The contrast dye (gadolinium chelate) used in MRI scans does not contain iodine and rarely causes allergic reactions. Severe reactions, such as difficulty breathing and swelling of the lips and mouth, are even rarer, occurring in only about 1 in 10,000 people given gadolinium.
Before your MRI scan you have to inform your doctor and the MRI technologist about the following:
Sufficient MRI images are assured only if the patients remain perfectly still and follow breath-holding instructions during the scan therefore it is essential you follow the instructions of our MRI technologist.
The limitations of MRI scan are the followings: