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MRI

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by Clara Jordan on 3 January 2011

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Transcript of MRI

MRI Magnetic Resonance Imaging History of MRI First clinical use - Nottingham University Hospital in 1967 Invented by Edward Purcell and Raymond Damadian Dr. Raymond V. Damadian Born: March. 16. 1936 in Melville, New York Discovered that tumors and normal tissue can be distinguished using nuclear magnetic resonance (NMR) because of their relaxation times.
First to perform a full body scan of a human being in 1977 to diagnose cancer.
His invention was able to locate cancerous tissue without producing an image. His method was later replaced with other methods, because it was not reliable and effective enough. Edward Mills Purcell Born: August. 30. 1912 in Taylorville, Illinois Died: March. 7. 1997 December 1945 - discovered nuclear magnetic resonance (NMR) with Robert Pound and Henry Torrey.

Won the Nobel Prize for Physics with Felix Bloch in 1952 for discovery (in 1946) of nuclear magnetic resonance in liquids and in solids. some safety/comedy issues Full Body MRI First full body exam 3rd July 1977 Two types of MRI scanners:
open and closed Open MRI scanners alleviate the fears of claustrophobic patients but images are not as good quality Brain MRI How does it work? Benefits of MRI Non-invasive Does not involve exposure to radiation Clearer and more detailed than other imaging methods. Relatively quick (30-60 mins) Cons Expensive - 1.5 tesla scanner - $1.5 million USD
3.0 tesla scanner - $2.3 million USD

Reported side effects: headache, dizziness, fatigue, nausea Makes a lot of noise (controlled by earplugs) Protons Inc. protons in 1T precess at 42.6 MHz the magnets go here... - 1.5 to 3 T (medical) - NO ionising
radiation - other uses - Shielding - magnetic/RF - acoustic - 120 dB
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