pulse programmer of MRI

Essay specific features

 

Issue:

Technology

 

Written by:

Mary P

 

Date added:

April 3, 2011

 

Level:

University

 

Grade:

A

 

No of pages / words:

22 / 6158

 

Was viewed:

8541 times

 

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Essay content:

Unlike CT it uses no ionizing radiation, but uses a powerful magnetic field to align the magnetization of hydrogen atoms in the body. Radio waves are used to systematically alter the alignment of this magnetization, causing the hydrogen atoms to produce a rotating magnetic field detectable by the scanner...
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This signal can be manipulated by additional magnetic fields to build up enough information to reconstruct an image of the body. Magnetic resonance spectroscopy is used to measure the levels of different metabolites in body tissues. The MR signal produces a spectrum of resonances that correspond to different molecular arrangements of the isotope being "excited"...
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