CT Imaging Issues in the Critically Ill
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CT Imaging Issues in the
Critically IllE. Wiebe, MD, FRCPC
Department of RadiologyUniversity of Alberta
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I have no financial or other disclosures
CT Imaging Issues in the
Critically Ill
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Imaging Issues and Strategies
Patient selection Region of interest Use of contrast IV contrast Use of oral contrast Contrast risk Radiation risk
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Imaging Issues and Strategies
Patient selection Clinical findings Prior imaging findings Imaging limitations and access Relative contraindications
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Imaging Issues and Strategies
Patient selection Region of interest
Clinical findings Mechanism of injury Previous imaging findings
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Imaging Issues and Strategies Noncontrast exam
Acute retroperitoneal hemorrhage Bone injuries Aortic dissection or rupture
IV Contrast use Vascular injuries and diseases Solid organ assessment Bowel wall assessment
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Imaging Issues and Strategies Oral contrast use
Positive contrast (eg. Telebrix or Gastrografin Demonstates bowel leak Impairs bowel wall assessment Variable lumen distention
Negative contrast (eg. Water or Polyethylene glycol solution)
Better assessment of bowel wall Cannot identify bowel leak
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Imaging Issues and Strategies
Contrast risk Anaphylactoid reaction Nephrotoxicity
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Imaging Issues and Strategies Anaphylactoid reaction
Dose and concentration independent Screen patients for increased risk Preventative premedication with
corticosteroids and antihistamines No correlation or association with
shellfish allergy and povidone-iodine skin cleansing solution
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Imaging Issues and Strategies Nephrotoxicity
recent meta-analysis suggested that the risk of contrast-induced nephrotoxicity is less than previously suggested (Radiology 2010; 256:21–28)
Most recent study concludes that there is increased risk in patients with estimated GFR of <40ml/min (Radiology 2013: 268:719-28)
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Imaging Issues and Strategies Nephrotoxicity
Dose dependent Intravenous hydration is most important
preventative measure Consider benefit of noncontrast scan
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Imaging Issues and Strategies
Radiation dose and risk Main concern is induction of cancer ALARA principle Recognize the relative risk of CT and
radiography Use technology advances made to
decrease dose
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Imaging Issues and Strategies
Radiation dose Measured as effective dose in mSV Background radiation dose: 3mSv/yr Standard CT abdomen dose: 8-10mSv
for single scan Low dose exams decrease dose to 2-
4mSv/scan
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Imaging Issues and Strategies Radiation dose
Dose estimate based on dose-length product (DLP) which is given with each scan
Chest CT dose = 0.017 x DLP Abdomen CT dose = 0.015 x DLP Head CT dose = 0.023 x DLP Neck CT dose = 0.059 x DLP
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625 x 0.015 = 9.37 mSv659 x 0.015 = 9.88 mSv630 x 0.015 = 9.45 mSv
Total effective dose = 28.7 mSv
Imaging Issues and Strategies
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Total effective dose = 166 x 0.017 = 2.82 mSv
Imaging Issues and Strategies
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Imaging Issues and Strategies
Tailor exam to clinical situation Use intravenous and oral contrast
when necessary but not always Be aware of risks of imaging
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Questions?