Science Photo of the Day
Submitted by rkrampf on Sat, 02/06/2010 - 23:13
Sorry about skipping yesterday's Science Photo. I was at Mayo Clinic for some tests. This is a shot from the MRI series of my brain. What does MRI stand for, and how do they work?
Excellent! MRI stands for Magnetic Resonance Imaging. To produce the images, a person is placed inside a very powerful electromagnet. When the magnet is turned on, the magnetic field is strong enough to cause the protons in hydrogen atoms to align with the magnetic field.
Since the human body is mostly water, it has lots of hydrogen atoms. When the magnet is turned off, the hydrogen atoms return to their previous alignment, giving off energy in the form of radio waves.
That radio signal is picked up by sensors. Different tissues have different amounts of water, so the signal varies from one tissue to another. That makes the MRI very useful in seeing different types of tissue, as well as abnormalities such as tumors.
mayo clinic?
in arazona?
RE: Mayo Clinic
No, the Mayo in Jacksonville, right here at home. It sure is nice to have them so close.
Mmmmhhh...
Is THAT you ?! Mmmhh... you look different, today... I don't know, maybe because you're a bit dark ?! And where is your beard ?! ;-)
- MRI means "Magnetic Resonance Imaging". -
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PS: -- When is the next video coming ?! --
mri
MRI stands for magnetic resonance imaging. it works by using a magnetic field to align the nuclear magnetization of hydrogen in water in the body. Radio frequency fields alter the alignment of the magnetization causing the hydrogen to produce a rotating magnetic field detectable by the scanner. The signal can be manipulated by more fields to build an image of the body.
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