Magnetic Resonance Imaging

  

See "pre-register" link for prep and consent information

Magnetic Resonance Imaging (MRI) is a non-invasive method of producing extremely detailed pictures of body tissues and organs without the need for x-rays.  The electromagnetic energy that is released when exposing a patient to radio waves in a strong magnetic field is measured and analyzed by a computer, which forms two or three dimensional images that may be viewed on a TV monitor.

MR Angiography (MRA) is a non-invasive MRI study of the blood vessels. It utilizes MRI technology to detect, diagnose and aid in the treatment of heart disorders, stroke, and blood vessel diseases. MRA provides detailed images of blood vessels by using a special form of contrast media, “dye”, usually given to make the MRI images even clearer. The procedure is painless, and the magnetic field is not known to cause tissue damage of any kind.

HOW IS THE PROCEDURE PERFORMED?

The MRI scanner is a tube surrounded by a giant circular magnet. It is a short-bore variety in a room with shielded windows, aiding in the perception of being more open, in order to make the patient experience much more pleasant.  The patient is placed on a moveable bed which is inserted into the magnet.  A typical exam consists of two to six imaging sequences, each taking two to 15 minutes. Depending on the type of exam, the total time needed can range from 15 to 60 minutes.  When contrast material “dye” is needed, a substance called gadolinium is given by IV injection during one of the imaging sequences.  It highlights blood vessels, making them stand out from surrounding tissue. 

Who interprets the results and how do I get them?

NWDC Diagnostic Imaging has an agreement with a group of board-certified radiologists to facilitate our procedures and interpret the results.  A diagnostic report will be sent to your doctor's office within forty-eight (48) hours of your procedure.  In the event of an abnormal test result, the radiologist will contact your doctor's office by telephone.

PREPARING FOR THE PROCEDURE

The magnetic field used for MRI / MRA will pull on any iron-containing object in the body.  If there is any question about your patient, an x-ray can be taken to detect metal objects. 

Other medical conditions that prevent an MRI / MRA procedure include:

  • Specific cardiac valves                              
  • Aneurysm clips      
  • Metal fragments or foreign body
  • Any prosthesis
  • Intrauterine device   
  • Cardiac pacemaker
  • Certain inner ear implants    
  • Insulin or infusion pump 
  • Electronic implant or device
  • Pins, screws or staples

Patients will be asked to complete a questionnaire to answer questions regarding these issues.  If the patient has a history of allergy to contrast material (such as iodine), the requesting physician and radiology staff should be notified. The radiologist will want to know if the patient is pregnant or claustrophobic, requiring sedation.