Doctors of USC

Prior to Procedure

In the days leading up to your MRI exam:

• Avoid using hair gel, spray, lotions, powders, and cosmetics.
• If your doctor prescribes a sedative:
  • Arrange for a ride home.
  • Do not eat or drink at least 4 hours before the exam.
  • Take the sedative 1-2 hours before the exam, or as directed.

Once at the MRI center:

• You will be asked about the following:
  • Medical history
  • Pregnancy
  • Allergies
  • Prior head surgery
• You'll remove any metal objects (eg, jewelry, hearing aids, glasses).
• An x-ray may be taken to check to see if there are any metal objects in your body.
• You'll also remove all objects from your pockets.

During Procedure

You may be:

• Given ear plugs or headphones to wear (The MRI machine makes a loud banging noise.)
• Given an injection of a contrast dye
• Allowed to have a family member or friend during the test

Anesthesia

None. If you have a fear of enclosed spaces, you may be given a sedative.

Description of the Procedure

You lie very still on a sliding table. Depending on your condition, you may have monitors to track your pulse, heart rate, and breathing. The table is slid into the narrow, enclosed cylinder. (There are also open MRI machines.)

The technician leaves the room. Each of the MRI sequences is performed. Through the intercom, the technician gives you directions, such as to hold your breath. You can talk to the technician through this intercom, as well. If a contrasting dye is used, a small IV needle is inserted into your hand or arm. This is done before you are slid into the machine. First, a saline solution is dripped into your vein to prevent clotting. Then, the dye is injected. When the exam is done, you are slid out of the machine. The IV needle is removed.

After Procedure

You will be asked to wait until the images are examined. The technician may need more images.

How Long Will It Take?

40-90 minutes

Will It Hurt?

The exam is painless. If you have dye injected, there may be stinging when the IV needle is inserted. You may also feel a slight cooling sensation as the dye is injected. If you have a fear of enclosed spaces, the exam may be very difficult for you. Your doctor may have you take a sedative. You can also ask your doctor about an open MRI, which is larger and has openings on all sides.

Possible Complications

Allergic reaction to contrast dye (rare)

Average Hospital Stay

None

Postoperative Care

• If you took a sedative, do not drive, operate machinery, or make important decisions until the sedative wears off completely.
• If you are breastfeeding and receive a contrast dye, wait at least 24 hours after the exam before breastfeeding again.