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20 Cards in this Set
- Front
- Back
Indications for CT exams of the abdomen include:(3)
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the detection of masses, lesions, and vascular abnormalities in the liver, gall bladder, spleen, pancreas, kidneys, adrenals, and GI tract
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Oral contrast agents are not administered for _____________ or detection of _____________.
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abdominal CTA
ureteral calculi |
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The opacification of the GI tract is necessary in order to reduce the risk of misdiagnosing fluid-filled bowel as a(n) ________________ or ______________.
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abscess
tumor |
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Typical IV contrast agent doses for abdomen CT's are ____________ mL at a rate of _____________ per second.
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100 to 150mL
2 to 3 mL |
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What is the delay time for a pancreatic mass?
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50 to 60
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What is the delay time for a biphasic scan of the pancreas?
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25 to 30 seconds(arterial)
60 to 70(portal venous) |
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What is the delay time for a biphasic scan of the liver?
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20 to 25 seconds (arterial)
65 to 75 seconds (portal venous) |
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What is the delay time for a spleen scan?
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75 to 85 seconds
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What is the delay time for a kidney/adrenal scan?
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75 to 85 seconds
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Vascular Abdomen CT:
IV protocol? |
100 to 150mL
rate of 4 to 5 mL/sec |
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Vascular Abdomen CT:
Scan coverage? |
dome of the liver superiorly through the region of interest inferiorly.
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Vascular Abdomen CT:
What slice thicknesses are used in reconstructions? |
standard vascular: 5mm slices
MIP reconstructions: 0.5 to 2.0mm overlapping slices |
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Vascular Abdomen CT:
mAs? |
200 to 300 mAs
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Vascular Abdomen CT:
filming and post-processing? |
soft tissues WW 300-350 WL 0-50
Liver windows WW120-160 WL 40-70 Sharp recon algorithm if high res is necessary |
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Liver and Gall Bladder scans:
There is substantial enhancement of the liver compared to tumors during the ________________ phase. |
non-equilibrium
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Liver and Gall Bladder scans:
IV contrast protocol? |
100 to 150mL
2 to 3 mL/sec delay of 65 to 75 seconds |
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Liver and Gall Bladder scans:
A 25 second delay after IV contrast injection would yield the early part of _________________ or the ___________________. |
non-equilibrium phase
hepatic arterial phase |
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Liver and Gall Bladder scans:
slice thickness in reconstructions? |
5mm contiguous slices
0.5 to 2mm overlapping slices through abnormal region |
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Liver and Gall Bladder scans:
mAs? |
200 to 300 mAs
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Liver and Gall Bladder scans:
filming and post-processing? |
soft tissues:
WW 300 to 400 WL 0 to 50 Liver Windows: WW 120 to 160 WL 40 to 70 |