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ct angiogram
This study employs a summation of finely sliced ct (computed axial tomography) scans through the brain, after IV (intravenous) contrast has been given.  On each slice, the arteries in the brain are seen, and the computer will add up these slices and produce a smooth image of the vessels.  This is very helpful in allowing the physician to see the "three dimensional" architecture of the blood vessels, which may be extremely useful in planning a surgical approach to aneurysms and arteriovenous malformations.

 

 

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