Overview of MRI Scan

 Magnetic resonance imaging (MRI) is a medical imaging technique that uses a magnetic field and computer-generated radio waves to create detailed images of the organs and tissues in your body.

Most MRI machines are large, tube-shaped magnets. When you lie inside an MRI machine, the magnetic field temporarily realigns water molecules in your body. Radio waves cause these aligned atoms to produce faint signals, which are used to create cross-sectional MRI images — like slices in a loaf of bread.

The MRI machine can also produce 3D images that can be viewed from different angles.

Why it's done

MRI is a noninvasive way for your doctor to examine your organs, tissues and skeletal system. It produces high-resolution images of the inside of the body that help diagnose a variety of problems.

MRI of the brain and spinal cord

MRI is the most frequently used imaging test of the brain and spinal cord. It's often performed to help diagnose:

  • Aneurysms of cerebral vessels
  • Disorders of the eye and inner ear
  • Multiple sclerosis
  • Spinal cord disorders
  • Stroke
  • Tumors
  • Brain injury from trauma

A special type of MRI is the functional MRI of the brain (fMRI). It produces images of blood flow to certain areas of the brain. It can be used to examine the brain's anatomy and determine which parts of the brain are handling critical functions.

This helps identify important language and movement control areas in the brains of people being considered for brain surgery. Functional MRI can also be used to assess damage from a head injury or from disorders such as Alzheimer's disease.

MRI of the heart and blood vessels

MRI that focuses on the heart or blood vessels can assess:

  • Size and function of the heart's chambers
  • Thickness and movement of the walls of the heart
  • Extent of damage caused by heart attacks or heart disease
  • Structural problems in the aorta, such as aneurysms or dissections
  • Inflammation or blockages in the blood vessels

MRI of other internal organs

MRI can check for tumors or other abnormalities of many organs in the body, including the following:

  • Liver and bile ducts
  • Kidneys
  • Spleen
  • Pancreas
  • Uterus
  • Ovaries
  • Prostate

MRI of bones and joints

MRI can help evaluate:

  • Joint abnormalities caused by traumatic or repetitive injuries, such as torn cartilage or ligaments
  • Disk abnormalities in the spine
  • Bone infections
  • Tumors of the bones and soft tissues

MRI of the breasts

MRI can be used with mammography to detect breast cancer, particularly in women who have dense breast tissue or who might be at high risk of the disease.

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