MRI (Magnetic Resonance Imaging) first appeared as a clinical tool in the early 1980's but has developed considerably over the last 20 years to now represent the optimal imaging technique for many clinical problems. It uses changing magnetic fields and radio-frequency waves to analyze the distribution of free protons within the body. Whilst this might seem rather worrying, the worldwide experience of the last 20 plus years has not demonstrated any harmful clinical effects at diagnostic field strengths. This is not to say that MRI is safe in all situations. Because it employs strong magnetic fields metallic devices can cause problems. Pacemakers and some other stimulators must not go into the magnet. Most other metalwork, including joint prosthesis, surgical clips and metal heart valves are however safe to enter the scanner. A comprehensive safety check will clarify this for you prior to scanning. Click here to download the MRI Safety questionnaire A detailed explanation of the physics of MRI is outside the scope of this summary but if you are interested then more information is widely obtainable on the web. Click here to visit the Wikipedia Page on MRI
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