fig2

Figure 2. Dual-MIP annotation workflow, starting from the raw CTA: Step 1: Generate 10-mm-thick axial and coronal MIP slabs. Step 2: Annotate vessel branches on both MIPs in 3D Slicer. Step 3: Back-project these 3D labels into the CTA volume via a depth-map algorithm to obtain the final refined annotation. MIP: Maximum intensity projection; CTA: computed tomography angiography; 3D: three-dimensional; ROI: region of interest.