Magnetic Resonance Imaging (MRI)
magnetic resonance imaging (MRI) is a test that uses a
magnetic field and pulses of radio wave energy to make pictures of organs and
structures inside the body.
radiologist may discuss initial results of the MRI
with you right after the test. Complete results are usually ready for your
doctor in 1 to 2 days.
An MRI can sometimes find a problem in a
tissue or organ even when the size and shape of the tissue or organ looks
Magnetic resonance imaging (MRI)
The organs, blood vessels, bones, and
joints are normal in size, shape, appearance, and location.
No abnormal growths, such as tumors, are
No bleeding, abnormal fluid, blockage in
the flow of blood, or bulges in the blood vessels (aneurysms) are
No signs of inflammation or infection are
An organ is too large, too small, damaged,
Abnormal growths (such as tumors) are
Abnormal fluid from a cause such as
bleeding or an infection is present. Fluid is found around the lungs or heart.
Fluid is found around the liver, bowel, or other organ in the
A blood vessel is narrowed or blocked. An
aneurysm is present.
Blockage in the gallbladder
bile ducts or in the tubes (ureters) that
lead out of the kidneys is present.
cartilage is seen. Bones are broken or show infection
Problems of the nervous system are present,
multiple sclerosis (MS),
Alzheimer's disease, or
herniated disc .
What Affects the Test
Reasons you may not be able to
have the test or why the results may not be helpful include:
- Pregnancy. An MRI test usually is not done
during pregnancy. But MRI may be done to get more information about a possible
problem that cannot be seen clearly with
- Medical devices that use
electronics, such as a pacemaker or medicine infusion pump. The MRI magnet may
cause problems with these devices, and that may keep you from having an
- Medical devices that have metal in them. The metal might make
some of the detailed MRI pictures blurry. This may prevent your doctor from
seeing the organ that is being looked at. For example, an
intrauterine device (IUD) with metal may prevent your
doctor from seeing the uterus clearly.
- Inability to remain still
during the test.
Obesity. A person who is very
overweight may not fit into standard MRI machines.
Many modern medical devices that do not use
electronics—such as heart valves, stents, or clips—can be safely placed in most
MRI machines. But some newer MRI machines have stronger magnets. The safety of
MRI scans with these stronger MRI magnets in people with medical devices is not