Fig. 3 | Scientific Reports

Fig. 3

From: Clinical feasibility of deep learning-driven magnetic resonance angiography collateral map in acute anterior circulation ischemic stroke

Fig. 3

Images of a middle-aged patient at admission. The diffusion-weighted image (DWI) (A) shows an acute infarction in the right middle cerebral artery (MCA) territory (circle). Dynamic contrast-enhanced magnetic resonance angiography (DCE-MRA) image (B) reveals occlusion of the M1 segment of the right MCA (arrow). The conventional MRA collateral map derived from DCE-MRA (C–G) and deep learning (DL)-driven MRA collateral map (H–L) demonstrate that hypoperfused area exceeds 50% of the right MCA territory in the capillary phase (circles in D and I) compared to the collateral perfusion of the left MCA territory. Lesions with hypoperfused area in the capillary phase decreasing by less than 50% in the early venous phase (circles in E and J) are categorized as collateral perfusion score 2. The baseline DWI lesion corresponds with the hypoperfused lesion in the early venous phase of the collateral maps (circles in E and J). The collateral perfusion information provided by the two collateral maps was consistent.

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