Frequently Asked Questions About MRI
Q: How is an MRI different from a CT or X-ray?
A: MRI does not use ionizing (X-ray) radiation. Instead, MRI creates high-quality images through the combination of a strong magnetic field and radio waves. MRI can detect certain diseases much earlier than other medical imaging techniques can, making it the diagnostic tool of choice for many physicians.
Q: Are there any restrictions to having an MRI exam?
A: Yes. Because the MRI machine uses a strong magnetic field, which will move objects made of ferrous metals, let your doctor know if you have:
- A pacemaker
- A defibrillator
- Aneurysm clips
- Cochlear implants
- A neuro-stimulator
- Metal implants
- Steel surgical staples or clips
- An implanted drug infusion device
- Heart stents or biliary stents
- Any implant made partially or wholly of iron or steel
Even metal objects not made of iron or steel can interfere with the exam – so don't bring any of the following into the examination room (a secure place to store your valuables will be provided):
- Coins
- Jewelry
- Watches
- Keys
- Dentures or partial plates
- Hearing aids
Q: Can you scan my whole body while I’m in there?
A: No. MRI is very specific and we can only scan the area that the physician has indicated on the requisition. We need to concentrate on that area to make certain that we get the best answer for you and your doctor.
Q: What happens if I can’t lay still or want to get off the table?
A: You will be able to communicate with the technologist with a call-bell and over an intercom throughout the exam. It is very important that you hold still during the entire time a set of pictures is being taken so the images turn out clearly. We take every measure to ensure that you are comfortable throughout the exam. On a rare occasion, patients may feel claustrophobic in the MRI scanner. Some of these people may require a light sedative during the examination which we will give to you in the form of a small tablet taken by mouth. In this case, you will not be able to operate your motor vehicle after the exam and will require a ride home.
Q: May I have an MRI exam when I am pregnant or breastfeeding?
A: While an MRI scan has no known side effects, it is not recommended for pregnant women unless it is medically indicated. If you are breastfeeding or pregnant please let your technologist know so they can go over the risks and benefits of the exam with you and your doctor.
Q: Why is the scanner so noisy?
A: The scanner works with strong magnetic fields. Inside of MRI machine there are parts called gradients. During a scan the gradients turn on & off so fast that they create a sound.
Q: Will I need a driver?
A: Some procedures require a driver for your safety (i.e., if sedation is administered for claustrophobia). If you are claustrophobic, inform the scheduler when the appointment is made.
Q: Will my head be in or out of the scanner?
A: The area of the body being scanned will be in the center of the scanner. For most procedures - with the exception of the head, neck, chest and upper abdomen - your head will remain outside the scanner.
Q: Is there any risk to having an MRI?
A: MRI is very safe. There are no health risks associated with the magnetic field or the radio waves used by the machine, nor have any side effects been reported. Patients with a pacemaker or certain types of aneurysm clips should not have an MRI.
Q: I am scheduled for an MRI arthrogram. Is the procedure painful?
A: During the injection of contrast into the joint, you may feel some slight pressure or discomfort as the joint is distended. The sensation is temporary and will pass within four to six hours after the procedure. Some soreness may also be present at the injection site for up to 24 hours.
Q: How soon after my shoulder injection may I resume normal activities?
A: You may resume regular activities immediately after the procedure. The radiologist will recommend, however, that you limit strenuous or "stress-bearing" activities on the affected joint for 24 hours following the procedure.