Fig. 3
From: Aortic dissection diagnosed on stroke computed tomography protocol: a case report
On computed tomography perfusion scan, delay (DLY), time to peak (TTP), and mean transit time (MTT) are elongated. Cerebral blood flow is decreased, but cerebral blood volume (CBV) is preserved in the region of the right middle cerebral artery. The lesions with elongated DLY, TTP, and MTT may indicate major vessel occlusion. An area with decreased CBV is diagnosed as an infarction, which is irreversible ischemic tissue damage. Because CBV remained almost normal, we determined that the patient had a large ischemic penumbra and no infarction yet in this case