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FIG 2. Images of a 50-year-old man with right internal carotid artery-posterior communicating artery aneurysm. Area with perfusion from the medial side is displayed by orange gradation, and area with perfusion from the lateral side is displayed by blue gradation. Three imaging planes were set up.
A, Plane A, sagittal plane, including internal carotid artery top. On plane A, the orange area (indicating perfusion from the ACA) is dominant (ratio of ACA area, 82%).
B, Plane B, 10-degree laterally tilted sagittal plane, including internal carotid artery top. On plane B, the blue area (indicating perfusion from the MCA) is becoming dominant (ratio of ACA area, 54%).
C, Plane C, 20-degree laterally tilted sagittal plane, including internal carotid artery top. On plane C, which is located near the superior frontal sulcus, the blue area is dominant (ratio of ACA area, 44%). Color scale shows P values.
D-F, Corresponding half Fourier single shot turbo spin-echo images are shown.
G, Digital subtration angiogram shows watershed (arrow) located in the middle of the middle frontal gyrus.
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