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Neuroradiology

QuestionAnswer
How do the following appear on CT scan: 1. White matter 2. Gray matter 1. appears dark (high myelin = ↑fat content) 2. appears white
How does a hemorrhage appear on CT: 1. immediately 2. after 1 week 3. after 2-3 weeks 1. coagulates immediately and shows up as hyperdense 2. isodense when clot breaks down 3. hypodense (cell death)
What IV contrast is used in: 1. MRI 2. CT 1. gadolinium 2. iodinated contrast
What are the benefits of gadolinium over iodnated contrast? gadolinium is less nephrotoxic and less prone to allergic rxns
How does infarction appear on CT 1. immediately 2. after 2-3 weeks 1. no change 2. hypodense (from cell death and edema)
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