FIG. 6.

Cerebral blood flow (CBF) asymmetry. When the CBF value obtained in the perfusion CT of the healthy side is subtracted from the defective side, a great asymmetry in favor of the healthy side (14.31 mL/100 g/min more in the healthy than in the defective side) is observed in patients who showed neurological improvement, whereas the asymmetry favors the defective side (12.8 mL/100 g/min more in the defective than in the healthy side) in patients who showed no improvement. These findings are more pronounced after the surgery.