Magnetic Resonance Imaging

MRI (Magnetic Resonance Imaging) is well-suited for obtaining highly detailed pictures of soft tissues, including the brain, the heart, spinal cord, muscles, tendons and joints. MRI has the ability to differentiate between tissues that are similar in density. 

The human body is primarily made up of fat and water, which contain many hydrogen atoms. These atoms each carry a magnetic resonance signal. MRI measures these signals using radio waves and magnetic energy to capture cross-sections or image "slices" of the body. By switching the radio signal on and off, the energy is absorbed by atoms in the body then reflected back out.

Unlike some other imaging devices, MRI can acquire pictures in four different planes of orientation:

• Axial: Dividing the tissue top and bottom
  
• Coronal: Dividing front and back
  
• Sagittal: Dividing right and left
  
• Oblique: Dividing at an angle
  
  
  Getting Ready For Your MRI:
  The day of your exam, it is best to wear loose, comfortable clothing such as a sweatshirt and sweatpants. If possible, avoid clothing with metallic objects such as zippers, snaps and grommets as well as under wire bras, because metal may interfere with the imaging process. If you must wear clothing with metal, you may be asked to change into a gown provided to you upon registration. You should also avoid using make-up and hairsprays. Before your exam, you will be asked to remove all metallic objects, such as eyeglasses, jewelry, wristwatches, etc.
  
  To improve the quality of the images, a contrast agent (a liquid substance that enhances the images) may be administered. If needed, Gadolinium, an intravenously administered contrast agent, is usually given midway through the exam.
  
  The Test:
  Your technologist will position you on the MRI table, making sure that the area of interest is placed in the middle of the scanner. You may be asked to hold your breath for up to 5 seconds as the abdomen or chest is being scanned. This helps avoid a blurred image.
  
  While the scanning is being conducted, you will hear several thumps or knocks. This is normal.
  
  Depending on the type of exam being done, an MRI can last from a few minutes up to a full hour.
  
  After the Test:
  After our MRI is complete, you may return to your normal activities.