MRI scanner. Magnetic resonance imaging (MRI) scanning is a diagnostic technique that produces 'slice' images through the body. The walls of the chamber contain a powerful cylindrical magnet,which forces the hydrogen atoms in the patient's tissues to align themselves parallel to each other. A pulse of radio waves then knocks the atoms out of alignment. As they fall back into alignment,they produce a detectable radio signal. MRI scans are usually used to study nervous tissue,for example the brain,and are helpful when looking for tumours or other abnormalities | |
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