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MRI Presentation

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by

Ellysia Li

on 5 June 2013

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Transcript of MRI Presentation

By Ellysia Li, Justina Gentili,
Tess Allen, and Elliot Lofts The MRI Machine History Behind MRI Machines MRI is Acronym for Magnetic Resonance Imaging
Isidor Isaac Rabi = Improved Molecular Beam Method which helps develop property for images
Isidor detected series of resonance frequency's to identify Molecular structure
1946 Edward Purcell/Felix Bloch ways to study M.R prop. of atoms/molecules in solids/liquids instead of 1.
Nuclear M.R further developed into image technique for medical diagnosis.
1956 Tesla Unit= calibrated unit for MRI (Strength of M.F)
Up until 1970's used for chemical and physical analysis.
1971 Raymon Damadian showed nuclear magnetic relaxation times of tissues and tumors differed = MRI used to study disease. More History... July 3, 1977 first full body scan
1980's MRI's commercially available
1990's used for neuroimaging/musculoskeletal imaging.
1993 MRI Images of the heart are possible
2000's they use Cardiac MRI, Body MRI, Fetal imaging, and functional MRI which are further developed in this time.
Most significant advancement: 2003 Paul C. Lauterbur and Peter Mansfield discovered using MRI's for diagnostic tool is possible and helpful. How it Works How it works How has it Changed Society? Used to see highly detailed images of... bones
blood vessels
organs
brain
joint problems Doctors use these to examine problems that happen inside the body that would be hard to see from the outside. Doctors prefer the MRI because... Gives minutely cross-sectional views High quality images Able to pick up even subtle differences in tissue A strong magnetic field is created by electric currents traveling through coils and wire loops
Another coil sends and receives radio waves
The MRI directs a radio frequency pulse towards the body
Causes protons to spin in different directions while absorbing the energy
When magnetic field is switched off, protons release the energy
MRI measures the released energy and then mathematically reconstructs the image An MRI can be used to more accurately identify problems in the central nervous system, diseases in softer organs like the lungs and liver, abnormalities in the abdominal area, and even breast cancer than other imaging techniques.
Because MRIs use radio waves, which are harmless in the body, MRIs have no identified health risks unless your body contains metal objects like artificial limbs or metal dyes from tattoos because of the magnet. Even if you have those items, at worst, the object may malfunction or you’ll have skin irritation around the area. What are the consequences? What are the consequences? MRI machine average cost is > $1 million Economic Consequence Social Consequences Magnet of scanner attracts metal Metallic implants have the risk of moving position and causing injury Objects such as: -Watches
-Jewelery
-Credit cards (will be erased) Screening check for presence of metallic objects in the body is important before MRI procedure
Removing metallic objects is important too Procedure ranges between $400 to $3,500 Location of hospital Expensive equipment Safer than XRAY and CAT scan Safety is a social issue.
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