| MRI (Magnetic resonance imaging) is a | | | | 1986, this time was reduced to approximately 5 |
| non-invasive imaging technique that uses a | | | | seconds. In 1993, functional MRI was developed |
| combination of a large magnet, radio frequencies, | | | | which showed the mapping of the function of the |
| and a computer to generate images of internal | | | | various regions of the human brain.An MRI |
| structures and organs of the body without using | | | | machine is a large tube-shaped machine running |
| x-ray radiation and surgery.MRI has been | | | | through the magnet from front to end. The |
| developed based on the principles of nuclear | | | | magnet creates a strong magnetic field around |
| magnetic resonance. NMR (nuclear magnetic | | | | the patient and sends pulses of radio waves from |
| resonance) was discovered by Felix Bloch and | | | | the scanner. These waves force the nuclei of |
| Edward Purcell in 1946. During the 1950s and | | | | hydrogen atoms out of their normal position. As |
| 1960s, NMR (nuclear magnetic resonance) was | | | | the nuclei realigns into their normal position they |
| used for chemical and physical molecular analysis. | | | | send out radio waves on their own. The |
| In 1971, Raymond Damadian showed that the | | | | computers or the scanners identify these signals |
| nuclear magnetic relaxation periods of tissues and | | | | and analyze and convert them into pictures with |
| tumors differed. In 1973, Paul Lauterbur used a | | | | minute details of the part of the body being |
| back projection technique similar to that used in | | | | examined. MRI scans are now widely used to |
| CT scans and demonstrated magnetic resonance | | | | examine organs, detect tumors and in the |
| imaging on small test tube samples. In 1977, | | | | diagnosis of many forms of cancer and injuries in |
| Raymond Damadian came up with the first whole | | | | bones and tissues.MRI provides detailed |
| body MRI scanner and performed a whole body | | | | information on MRIs, Open MRIs, Brain MRIs, MRI |
| scan in 4 hours and 45 minutes. In 1980, Edelstein | | | | Scans and more. MRI is affiliated with Digital |
| and coworkers could acquire a single image in | | | | Oscilloscopes. |
| approximately 5 minutes using Ernst's technique. In | | | | |