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- Know harmful effects from exposure to the magnetic field or radio waves
- May require a contrast material (which may cause allergic reaction)
- Can identify brain tumors, stroke and damage from heart attack or heart disease and many other items that will not show up under X-Ray Imaging
- It takes a long time compared to X-Rays or CT Scans
- A version called and MRA can observe arteries
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Magnetic Resonance Imaging (MRI) is primarily used in medical imaging to visualize the structure and function of the body. It provides detailed images of the body in any plane and can be reconstructed into a three dimensional image. MRI has much greater soft tissue contrast than Computed Tomography Scan (CT Scan or CAT Scan) making it especially useful in neurological, musculoskeletal, cardiovascular, and oncological imaging. Unlike the CT scan it uses no ionizing radiation, but uses a powerful magnetic field to align the magnetization of hydrogen atoms in the body. Radio waves are used to systematically alter the alignment of this magnetization, causing the hydrogen atoms to produce a rotating magnetic field detectable by the scanner. The collected signals are interpreted by a computer to create a composite, three-dimensional representation of your body. Any two-dimensional plane (slice) can be electronically created from this representation and displayed on a video monitor for examination. These images can be converted from the screen into photographic film for further viewing and analysis. There are no known harmful effects from exposure to the magnetic field or radio waves used in making MRI images. If your scan requires the injection of a contrast material, there is a very small risk of an allergic reaction. An MRI is a time consuming investigation compared to a CT Scan or and X-Ray. Some parts of the body, such as bone, are better investigated by simpler techniques. It is also not good for emergencies or accidents because of the long time it takes and the fact that all other medical equipment has to be removed from the room while the machine is running.
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Disclaimer
The content in this page is not a substitute for professional medical advice. Please contact your doctor before beginning any Magnetic Resonance Imaging program. -
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Magnetic Resonance Imaging Questions
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Simple Magnetic theory experiment? 2 AnswersThere are two interesting experiments for your kids. They would really enjoy doing these projects . they are simple and easy to do.Hope your kids enjoy. Magneti... read more -
What happens if the earth magnetic field reverses, will all the electronics continue to work? 1 AnswerCompared to the magnetic fields inside electric machinery, the one caused by the Earth is weaker by a factor of thousands. The field of the Earth has at most a ... read more -
Do Magnetic Motor generators exists? How much do they cost and where can they be bought? 1 AnswerWell, they exist, but they aren't for sale, or at least, not yet. Most of them are either research, small and homemade, or just theoretical. I found a list of... read more
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What generates the magnetic tube called a coronal loop? 1 AnswerIt is shown that the anomalously rapid damping of coronal-loop oscillations initiated by an external action (a shock wave from a solar flare) is completely expl... read more
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MRI Forums and Blogs
- Daily Strength: MRI Posts
- MedHelp: About Magnetic Resonance Imaging (MRI) (October 23, 2007)
- GameCritics.com: "Wiiitis" documented by magnetic resonance imaging (April 2, 2008)
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Magnetic Resonance Imaging waiting room now lunch with @shaniceclarke and RC. Yum Mexican!
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Today's 4pm Center for Advanced Study lecture by Kelly Joyce, "Visualizing Health: Magnetic Resonance Imaging in... http://bit.ly/d0rk9g
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