Fig. 2

Illustration of a patient with acute ischemic stroke. Multi-mode vascular findings on CT in patients with AIS. Panel A displays the intracranial CTA, indicating occlusion of the MCA supplying the parietal lobe (indicated by the white arrow). Panels B-D present CTP images (CBF, CBV, TTP) at horizontal portion of lateral ventricle, demonstrating reduced perfusion in the MCA territory, which suggests a transition to stage IIa before infarction. The center is exhibiting a small number of core infarct areas, with the main lesion’s extent largely correlating with the blood supply range of the frontoparietal artery. Panels E-F show ColorViz fused images of the right middle cerebral artery (MCA) supplying the frontal lobe. Panels E is a horizontal image of the flat lateral ventricle, while panel F depicts a horizontal image of the flat basal ganglia. Based on the arterial blood supply area, the responsible frontoparietal artery’s supply zone has been manually outlined on the ColorViz fused images. The vessels within the orbitofrontal artery show no significant reduction in caliber, with a few green vessels visible in the image. According to the 6-point collateral circulation grading system, these vessels are classified as grade 4. In contrast, the MCA supplying the parietal lobe exhibits reduced vessel caliber and the presence of green and blue vessels, corresponding to a collateral circulation grade of 2. Panels G and H present DWI images obtained two days after onset; panel G shows the image at the level of the flat lateral ventricle, while panel H shows the image at the level of the flat basal ganglia. These images reveal large infarcts in the superficial temporal-parietal lobe (supplied by the MCA), with a maximum infarct area of 1297 mm². The infarct site is concentrated within the blood supply range of the frontoparietal artery, which has a vascular grade of 2. No new infarct lesions were observed in the blood supply range of the orbitofrontal artery, which maintains a vascular grade of 4