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What is an MRI, (magnetic resonance imaging)?
An MRI is a painless, non-invasive procedure that enables physicians to view detailed, internal images of the human body without using x-rays. This technology uses a large magnet, radio waves and a computer to scan patients. MRI is especially useful in imaging the brain, spinal cord, musculoskeletal system, abdomen, pelvis, and major blood vessels. In some cases, an MRI can detect diseases early.
How are examinations completed?
The scan room has a large donut-shaped magnet with a padded table that moves the patient into the center of the machine once properly positioned. Whether or not you go into the machine head first or feet first, and how far in you go, is determined by the type of exam being performed. In some cases a special piece of equipment called a coil, which is like a radio antenna, is placed on or wrapped around the body part that is being imaged to capture a signal. The scanner is equipped with an emergency assistance alarm button and a two-way intercom for communication with the technologist. It is important that patients relax and try not to move during the scan as even slight movements can cause distorted images that will have to be repeated.
How long is the examination?
The exam consists of several different scans that vary in length. Most exams take 30 to 45 minutes, but there are a few exams that take one to two hours.
Are there any restrictions?
Due to the strong magnetic field, some patients with surgically implanted devices or objects cannot be scanned. Physicians review each patient's medical history and determine whether or not an MRI scan can be performed.
Why do you need to know about metal implants in my head, if I'm having my back scanned?
Although we focus on one specific area when patients are scanned, the entire body does go into the scanner. We need to know about metal anywhere in or on the body because the magnet is never turned "off ".
Can I have an MRI if I am pregnant?
No adverse side effects have been proven from performing MRI during pregnancy. However, it is considered wise to avoid having an MRI during the first trimester of pregnancy unless deemed absolutely necessary by a physician. Whenever possible, the MRI should be postponed until the conclusion of the pregnancy.
How long do I have to wait for an appointment?
The demand for an MRI is high and the waiting periods vary. Urgent requests and emergencies are incorporated into the schedule as needed. Once we receive a request for an MRI, we schedule an exam date and contact the referring physician.
What is MRI contrast? How safe is it?
Some exams may require the injection of a contrast agent called gadolinium. This contrast agent is a colorless fluid, which is injected into a vein. The contrast agent is very safe and is very different from those used in x-ray.
What is the difference between MRI and CT?
MRI uses a large magnet and radio waves to produce images of your body while a CT scanner uses ionizing radiation. With an MRI, there is no exposure to ionizing radiation and there are no known side effects.
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