Choosing modality, signal characteristics on T1 and T2, head CT bleed types, stroke imaging, spine MRI and contrast safety.
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- Which imaging modality is preferred for acute head trauma because it is fast and widely available?
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CT (computed tomography)- What is the first-line imaging study when acute stroke is suspected?
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Non-contrast CT of the head- Which modality is preferred for detailed evaluation of the posterior fossa and brainstem?
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MRI- Between CT and MRI, which shows cortical bone detail better?
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CT- Does MRI expose the patient to ionizing radiation?
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No- Give an absolute contraindication to MRI scanning.
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A non-MRI-conditional cardiac pacemaker or other incompatible implanted metal device- Which modality is the study of choice for evaluating suspected spinal cord compression?
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MRI- Which MRI sequence is most sensitive for detecting hyperacute ischemic stroke, often within minutes of onset?
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Diffusion-weighted imaging (DWI)- Which study is used to detect a large vessel occlusion before mechanical thrombectomy?
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CT angiography (CTA)- In patients who cannot undergo MRI, what CT-based technique evaluates the spinal canal and nerve roots?
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CT myelography- Appearance of fat on a T1-weighted MRI image
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Bright (hyperintense)- Appearance of CSF on a T1-weighted MRI image
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Dark (hypointense)- On T2-weighted MRI, CSF (cerebrospinal fluid) appears ____.
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bright- How does rapidly flowing blood within a vessel typically appear on standard MRI sequences?
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Dark, a signal void- Gadolinium contrast agents shorten ____ relaxation time, which makes enhancing tissue appear bright on T1-weighted images.
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T1
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