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3 Cards in this Set

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  • Back
what are hounsfield units (HU)?
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
what are the 5 phases of a contrast CT?
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+)
what is a the risk of a repeat reaction in a pt with a h/o prior severe reaction to IV contrast?
18.5%