Figure 6:(A) CT scanner console display, with the protocol parameters chosen for a CTP exam. Note the scan type selected is “cine”, with a 1.0 sec rotation time.
(B) Lateral scout view of the head with the slice localization set-up for a CTP exam. The gantry angle is roughly parallel to, and above, the orbital roof, to avoid radiation exposure to the lens. This slab is also at the level of the basal ganglia, which not only contains the MCA for the purposes of AIF selection, but also samples multiple vascular territories, including those supplied by the anterior, middle, and posterior cerebral arteries.