PSY318H5 Study Guide - Diffusion Mri, Choline, Demyelinating Disease

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27 Apr 2011
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Induce changes in the electrical activity of the brain. Sensitive to density of different parts of the brain, ventricles, nuclei and pathways. Record and manipulate ongoing changes in brain activity, including the electrical activity of cells, biochemical events, differences in glucose consumption and the flow of blood to various regions. Uses a large magnet and a specific radiofrequency pulse to generate a brain signal that produces an image. When horizontal magnetic field is turned off, protons relax. T1 - current detector having orientation horizontal to vertical axis of protons" initial alignment measure time it takes protons to right themselves from tipped position and realign with magnetic field. T2 - second detector having orientation perpendicular to that of first detector measure rate at which protons lose synchrony about the horizontal axis after the magnetic pulse is turned off. As neurons become active, they increase their use of oxygen and increase blood flow to the area.

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