A Short History of MRI Essay

2251 Words Jan 5th, 2014 10 Pages
What is MRI?

Magnetic resonance imaging (MRI) is a sophisticated computerized imaging technique, which has been a clinical diagnostic tool since 1980. MRI is used to create images with extraordinary detail of the body or brain by applying nuclear magnetic resonance phenomena. The distribution of hydrogen nuclei (protons), found in cellular water, depends on the tissue type and whether or not the tissue is healthy or diseased. MRI measures and records changes in the magnetic properties of these protons. The MRI technique uses a strong magnetic field, pulsed electromagnetic fields known as gradients, and radio waves to excite the protons and produce the image in the region of interest. The image is produced then displayed on a gray scale
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In 1973, Paul Lauterbur, a chemist and an NMR pioneer at the State University of New York, Stony Brook, produced the first NMR image.

Mike Goldsmith, one of the graduate students cobbled a wearable antenna coil to monitor the hydrogen broadcast detected by the coil.

On July 3, 1977, nearly five hours after the start of the first MRI test, the first human scan was made as the first MRI prototype.

How MRI works?

Magnetic Resonance Imaging is a medical diagnostic technique that creates images of the human body using the principle of nuclear magnetic resonance. It can generate thin-section images of any part of the human body - from any angle and direction. MRI is possible to make such a picture of the human body when the body is exposed to an electromagnetic field.

MRI creates a strong magnetic field and the small biological "magnets" in the human body consisting of protons located in the nucleus of the hydrogen atom are magnetized. The proton possess fundamental magnetic properties.

First, MRI creates a steady state of magnetism within the human body by placing the body in a steady magnetic field. Second, the MRI stimulates the body with radio waves to change the steady-state orientation of protons. Third, the MRI machine stops the radio waves and registers the body's electromagnetic transmission. Fourth, the transmitted signal are used to construct internal images of the body by computerized axial tomography.


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