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6 Cards in this Set
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- Back
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what does convention T1 weight MRI show well
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gross anatomy, good gray/white matter differntiation
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What does FLAIR show well
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can highlight tumors better, reveals edema within tumor and surronding tissue
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describe the concept of thresholding
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mathematical manipulaiton of the image so that only voxels with intesities above the threshold limit are displayed
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what is bold fMRI used for
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provides images of highly localized changes in blood flow and oxygenation that are driven by changes in net neural acitivity
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What is the mechansim of BOLD fMRI
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neural activity triggers local vasodilation and incrase in oygenated Hb, oxygenated Hb keeps the magentic field undisturbed so the water protons can emit a radio frequency (deoxy Hb disrupts the field leading to a weak signal from the protons)
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What are somve caveats to fMRI
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-don't understand how changes in activity related to blood flow 2. singals are slow
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