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3 Cards in this Set
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what are hounsfield units (HU)?
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the degree of attenuation of a given tissue on CT; air is -1000, pure water is 0, fat is -40 to -100; renal cysts with simple fluid is -20 to 20 HU
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what are the 5 phases of a contrast CT?
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1. non-contrast
2. arteriographic or early arterial phase (20 secs) 3. late arterial or cortiocomedullary phase (40-45 secs) 4. nephrographic phase (80-100s) 5. excretory phase (2min+) |
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what is a the risk of a repeat reaction in a pt with a h/o prior severe reaction to IV contrast?
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18.5%
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