Question:

How is SWI used in brain imaging?
1. To detect hemorrhage in patients with head trauma
2. To improve detection of demyelinating lesions.
3. To follow up tumor recurrence.
4. To diagnose non-hemorrhagic infarcts.
5. To detect congenital abnormalities.





Answer:

The correct answer for the question "How is SWI used in brain imaging?" is:

1. To detect hemorrhage in patients with head trauma



Explanation
a.  To detect hemorrhage in patients with head trauma. ["More recently, this technique has been used for better detection of extravascular deoxyhemoglobin and methemoglobin present in areas of hemorrhage in patients with diffuse axonal injury."]b.  To improve detection of demyelinating lesions. [SWI not useful for detecting demyelinating lesions.]c. To follow up tumor recurrence. [SWI not useful for following up tumor recurrence.]d. To diagnose non-hemorrhagic infarcts. [Diffusion-weighted imaging (DWI) is useful in diagnosing infarcts.  SWI can be useful in diagnosing hemorrhagic transformation.]e. To detect congenital abnormalities. [SWI has limited anatomic resolution, not useful in detecting congenital variants or anomalies.]



From the manuscript:
White Matter Microsusceptibility Changes in Patients With Hepatic Encephalopathy
Radiology Case. 2011 Aug; 5(8):1-7


This article belongs to the Neuro section.




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From the manuscript

White Matter Microsusceptibility Changes in Patients With Hepatic Encephalopathy

Free full text article: White Matter Microsusceptibility Changes in Patients With Hepatic Encephalopathy

Abstract
We report a new radiological finding in two patients with hepatic encephalopathy. A new susceptibility-weighted (SWI) magnetic resonance imaging sequence revealed multiple bilateral microsusceptibility changes in the corpus callosum and white matter, while the conventional T1 and T2 weighted images were unremarkable. We postulate that the etiology of the microsusceptibility changes may be related to hepatic coagulopathy and other factors, such as impaired cerebral blood flow and brain edema.






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