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Q: What is MRI?
A: Magnetic Resonance Imaging (MRI) is
a state-of-the-art technique that allows doctors to see inside
the human body in remarkable detail without using x-rays or
surgery. MRI images are produced with the use of a powerful
magnetic field, radio waves, and a sophisticated computer
system. The procedure is safe and painless.
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Q: What is MRA and how does
it work?
A: MRA, Magnetic Resonance Angiography, is a special type of Magnetic Resonance Imaging (MRI) that is tailored to visualize the blood vessels and blood flow in a specific part of the body. A large magnet and radio waves are used to produce images of the body that are transferred to a high-resolution screen for the radiologist to interpret. MRA produces clear, accurate pictures and there is little risk of complications. As a result, the procedure can decrease the need for, and the risks associated with, catheter angiograms that are typically done in a hospital.
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Q: What is the difference
between an MRI and a CT scan?
A: Both MRI and CT scans make cross-sectional images (slices) of almost any area of the body using a sophisticated computer system. The major difference is that an MRI uses a large magnet and radio waves to produce images while a CT scanner uses x-rays. Therefore, with the MRI studies, there is no exposure to x-rays. Both systems complement each other well as they both have their inherent strengths and weaknesses; however, CT usually can only directly acquire transverse (or crosswise) images, whereas MRI can directly acquire slices in any plane. In addition, MRI is superior when it comes to soft tissue contrast, and there are no known side effects. The ability to view pictures from multiple directions, high tissue contrast, and absence of x-rays make MRI a very powerful and increasingly popular imaging tool.
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Q: What does an MRI scanner
look like?
A: MRI Plus has a GE Signa Excite system. While having an MRI scan, you will be comfortably positioned on the table, usually on your back, with a small cushion under your knees. The table lifts up and slides into a cylindrical-shaped tube that is kept open at both ends during your entire scan. The part of the body being scanned will be positioned in the center of the tube, which is very well lit.
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Q: How do I prepare for my
scan?
A: Preparation for your MRI is very simple. You may eat normally (unless told otherwise) and should take any prescribed medications the day of the exam. We ask that you arrive 15-20 minutes early for your appointment and that you bring any related diagnostic tests (x-rays, CT scans, etc.) with you.
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Q: What happens after I get
to MRI Plus?
A: Upon arrival, our scheduling manager will greet and register you, and will collect any papers and/or diagnostic studies. You will fill out a screening form. You will be shown to a secure change room and asked to remove any metallic objects such as jewellery, glasses, hairpins, hearing aids, and possibly non-permanent dentures. Wallets, credit cards, and purses must also be left behind in our secure change rooms. Prior to the start of the scan, our technologist will conduct a brief interview with you regarding your medical history and the possible presence of metallic objects in your body. Finally, you will be taken into the scanning room where the technologist will have you lie on a padded examination table.
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Q: What happens during the
scan?
A: Once in the scan room, the technologist will help you onto a padded examination table where you will be placed lying down in a comfortable position. While the scan is in progress, you will hear intermittent knocking noises that are normal; there is no cause for alarm. The most important thing to remember is that you must remain motionless during the study to prevent the images from blurring. Throughout the test, you will be able to speak to the technologist via an intercom. Most exams take from 30-45 minutes and, unless you were pre-medicated, you may resume normal activities immediately afterwards.
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Q: When and from whom will
I get my results?
A: Our radiologist will interpret your scan, it will get transcribed, signed, faxed, and mailed to your doctor within two business days. Your doctor will have access to your MRI scans through the internet and will schedule a follow-up appointment with you to review your results.
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Q: What happens if I can't
lay still or want to get off the table?
A: While you are being scanned, the technologist will be in constant contact with you via an intercom system. If you feel uncomfortable at any time during the scan, you can speak to the technologist who will assist you accordingly.
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Q: Can you scan my whole
body while I'm in there?
A: No. This is one way that an MRI differs
from some other scans. With the MRI scanner, we can image
just about any part of the body; however, each scan is limited
to a specific body part or area. Each area we scan takes from
30-60 minutes.
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Q: Why does my whole body have to be in the scanner if you are only scanning my head?
A: The part of the scanner that takes the
pictures is located in the center of the scanner. Therefore,
in order to do a scan of your head, most of your body must
slide into the scanner for proper positioning. The same is
true for other studies of the spine and upper extremities.
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Q: Why do you want to know
about metal implants in my head if I'm having my back scanned?
A: Surgically implanted metallic pins, wires, rods, etc. are usually okay to be scanned, as are hip, knee or shoulder replacements, etc. All dental implants and fillings are also okay. However, certain metallic devices can cause interference with the scan, and their presence during the study may cause injury to you if the force of the magnetic field pulls the metal object. It is particularly important for us to know if you have a pacemaker, a defibrillator, a muscle stimulator or other implanted electrical device, a history of heart or brain surgery, brain aneurysm clips, shrapnel, or a history of getting metal fragments in your eyes. When you have the scan, even though we are focusing on one specific area, your whole body does go into the scanner. In fact, just walking into the scanning room puts you within the magnetic field since the magnet is never turned "off”. That is why we have to know about metal anywhere in/on your body. You will be asked on numerous occasions about any metal implants. Please try to be as thorough as possible when answering as this is for your safety.
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Q: How long will my scan
take?
A: The average MRI study takes about 30-40
minutes. Some scans may be shorter and some a little longer.
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Q: Where is MRI Plus located?
A: We are located at 61 Laurier Street, Gatineau, Quebec J8X 3V7, directly in front of the Museum of Civilization. We also offer free on-site parking.
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Q: Is it a problem if I
am breast-feeding or pregnant?
A: We normally do not scan pregnant women. If you think you might be pregnant, you must have a pregnancy test done or wait until your menstrual period begins before we can scan you. If you are breast-feeding, an unenhanced routine MRI is no problem. HOWEVER, if there is the possibility of your scan being enhanced with the contrast media, you should plan on bottle-feeding the baby for 48 hours after the scan until the contrast material has passed out of your system.
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Q: Will extended medical
benefits cover MRI scans?
A: Not all extended benefits insurance will cover the cost of your appointment. You must check with your plan administrator to see if you have coverage.
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Q: Why do you need my previous
x-rays, CT and MRI scans?
A: The more information that our radiologist has when reviewing your exam, the more specific the interpretation will be. Correlations with other studies are often helpful.
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Q: Will the results of my
scan be kept confidential?
A: Yes. The results will only be shared
with your referring physician and no one else without YOUR
permission.
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