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19 Cards in this Set
- Front
- Back
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Neuroimaging is divided into what two categories |
Structural and functional |
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How do CT scans work |
They use x-rays to provide information on the density of brain tissue |
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Very dense tissue on a CT scan would appear as what |
White |
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Less dense tissue on a CT scan would appear as |
Black |
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For CT scans the term hyperdense and hypodense refer to what |
Hyper dense refers to brighter areas and hypodense refers to darker areas |
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Areas of intermediate density in CT scans are called |
Isodense |
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You need to have when using intravenous contrast material 4 CT scans, more complex problem areas will as hyper-dense or hypodense |
Hyper-dense as these areas will absorb more material |
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How are MRIs different from CT scans functionally |
MRI scans are not described in terms of density rather they are described in terms of intensity or brightness |
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The term hyper-intense refers to what in a MRI The term hypo intense refers to what in an MRI |
Hyper-intense refers to a brighter area hypointense refers to a darker area |
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In terms of MRIs and CT scans which is better for detecting small lesions and which is better for detecting large anomalies |
MRIs are the preferred method for detecting small lesions CT scans are preferred for larger abnormalities |
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What is the downside of using MRIs over CT |
They are more expensive and take longer |
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What type of Imaging is used to visualize lesions of blood vessels |
Neuroangiography |
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What does the Wada test do |
It is helpful in localizing language function |
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How do electroencephalograph work |
A small metal discs that records electrical activity is placed on the brain to measure the activity of neurons in the underlining brain area |
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How are EEG s used |
They are useful in detecting widespread abnormality in brain function |
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What is a weakness of EEGs |
It's sensitivity and spatial resolution for detecting brain lesions are poor |
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What imaging uses radio active material |
PET |
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Does PET measure structure or function |
Function |
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Do fMRIs give info on structure or function |
Both |
