What
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Title: What

Essay Details:

Subject: Biographies
Author:
Date: November 22, 2013
Level: University
Grade: A
Length: 2 / 510

Essay text:

fMRI ? Used to monitor changes in blood flow and blood volume in the brain within a couple of hundred milliseconds, better spatial resolution than PET. fMRI offers poor selectivity, and requires a higher signal to noise ratio in order to get a good image. Whole brain areas as well as specific loci can be assessed and displayed within an anatomical framework. Also, non invasive ? Basic Principles of MR imaging o Image?the disruption of hydrogen atoms in tissue o There are difference in distribution of H+ atoms and magnetic properties of different tissues o Differences also reveal changes in blood flow o Based on different magnetic properties of oxygenated (arterial) and deoxygenated (venous) blood o When subjected to certain gradient echo pulse sequences, oxygenated blood provides a stronger MR signal?the difference between hemoglobin in oxygenated vs deoxygenated blood provides the fMRI image o Cognitive activation-vasodilation-where neurons are more active-oxygenated blood will exceed metabolic need ? +++Physics of fMRI Imaging o Fixed magnetic field is generated o varies from 0...

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