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TTP scoring system. We counted and totaled 14 cortical regions in 3 levels of cerebral hemispheres: ganglionic level (A), ventricular roof level (B), and high convexity (C). Each level is approximately 2 cm apart. An area of blue larger than one-half of 1 region is counted as 1 point, otherwise, it is counted as 0 points. The total TTP score of 1 hemisphere ranges from 0 to 14 points: 4, 8, and 2 for the anterior cerebral artery, MCA, and posterior cerebral artery areas, respectively.
