Magnetic
resonance imaging (MRI), sometimes called nuclear magnetic resonance imaging
(NMR), is a noninvasive, nonionizing diagnostic technique. It is useful in
detecting small tumors, blocked blood vessels, or damaged vertebral discs.
Because it does not involve the use of radiation, it can often be used in cases
where X-rays would be dangerous. Large magnets beam energy through the body,
causing hydrogen atoms in the body to resonate. This produces energy in the
form of tiny electrical signals. A computer detects these signals, which vary
in different parts of the body and according to whether an organ is healthy or
not. The variation enables a picture to be produced on a screen and interpreted
by a medical specialist. What distinguishes MRI from computerized X-ray
scanners is that most X-ray studies cannot distinguish between a living body
and a cadaver, while MRI “sees” the difference between life and death in great
detail. More specifically, it can discriminate between healthy and diseased
tissues with more sensitivity than conventional radiographic instruments like
X-rays or CAT scans.
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