Figure 1.
Regions of interest (ROIs) were placed on cortical regions in the middle cerebral artery territory.
ROIs were drew in (A) the reference CT image, and (B) vessel-removed mean transit time (MTT) map.
Figure 2.
CT Angiography (CTA) images in frontal projection before and after bypass in Moyamoya disease.
(A) The preoperative volumetric CTA acquired in the arterial phase of whole-brain CT perfusion (CTP) shows the left internal carotid artery (ICA) is occluded in the supraclinoid portion, and “Moyamoya vessels”(arrow) can be seen in the cerebral base. The right supraclinoid ICA and the proximal anterior cerebral artery (ACA) and middle cerebral artery (MCA) are markedly stenosed. (B) The arrows indicate the left-side direct graft patency with collateral vessels from the left external carotid artery to the MCA territory on the postoperative volumetric CTA acquired in the arterial phase of whole-brain CTP.
Figure 3.
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.
Table 1.
Comparison of Preoperative Perfusion CT Values of Potential Surgical Side in the Region of Middle Cerebral Artery and Those of Contralateral Side [mean±SD; median (P25–P75)].
Table 2.
Comparison of Perfusion CT Values of Surgical Side in the Region of Middle Cerebral Artery Pre- and Post-operation [mean±SD; median (P25–P75)].