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