CT perfusion images before and after surgery.

Images show cerebral hemodynamics changes of pre- and post-operation of a left-sided superficial temporal artery-to-middle cerebral artery anastomosis in Moyamoya disease. Axial perfusion CT images show reduced (A) cerebral blood flow (CBF), increased (B) cerebral blood volume (CBV), delayed (C) mean transit time (MTT), and (D) time to peak (TTP) in the region of left middle cerebral artery before surgery. The postoperative whole-brain perfusion CT images show increased (E) CBF, reduced (F) CBV, (G) MTT and (H) TTP in the region of left middle cerebral artery.