Medical imaging provides several imaging tests that help doctors make diagnosis and treat their patients properly. Two such tests are the MRI and the CT scan. Both are painless and non-invasive procedures that can help diagnose everything from a torn tendon to brain cancer. The power of the machines are remarkable, as they are able to produce cross-section images of your organs, tissues or bones.
MRI
Magnetic resonance imaging, also known as an MRI, is a large magnet that is shaped like a tube. You lie down on a table that moves you into position inside the tube based on the image that is needed. The magnets align water molecules in your body and then radio waves cause these joined particles to produce a signal. This signal is used to create cross-sectional images of your body. There is no risk of exposure to radio waves or magnetic fields so the test is safe for most people. You should remove anything metal from your body before going into the exam room. Make sure the technologist is aware if you have a pacemaker, metal clips in your arteries or if you may be pregnant.
Common Tests
An MRI is used to test for a host of conditions and diseases. It is an easy and non-invasive way to look at your tissues, organs and skeletal system. Your doctor may request an MRI to look for tumors, aneurysms, stroke and spinal cord injuries. They can also focus on the heart and blood vessels to look for plaque buildup and any heart disease damage. The internal organs are commonly tested using an MRI to look for abnormalities such as tumors. An MRI of the bone can detect infection.
CT Scan
Computerized tomography, also known as a CT Scan, is an X-ray technique. Like a traditional X-ray, your body will be exposed to a slight amount of radiation. It's important your doctor know if you are pregnant if he wants to do a CT scan due to this exposure. The CT scanner is a machine with a hole in it. The table slides into the hole and into position. The X-ray unit inside the machine rotates around your body to provide cross-sectional imaging of your body.
Common Tests
Your doctor may order a CT scan for a number of reasons. CT's can detect the inner structure and anatomy of organs as well as bones. It can be used to diagnose bone tumors and fractures, blood clots, cancer and internal bleeding. CT's are safe for those with pacemakers. You may be instructed to drink a contrast liquid before your scan. This can help to emphasize blood vessels and other structures.
Comparison
Both tests have their advantages and disadvantages. An MRI usually takes longer than a CT scan and is usually more expensive. The time for an MRI is typically 30 minutes, where a CT scan can be done within five. An MRI is usually better at detailing soft tissue such as tendons and menisci. Details of bone structure, blood vessels and organs are typically better seen with an CT scan. Your doctor will be able to advise the correct exam to order based on your medical history and symptoms.
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