Fig. 1.

Intraoperative view of ICG fluorescence imaging of the gastric conduit. a Regions that were visualized between 15 and 40 s after ICG injection were categorized as rapid perfusion areas (left side arrow), and regions that were not visualized after injection were categorized as low perfusion areas (right side arrow). b Regions that were visualized between 40 and 60 s after ICG injection were categorized as slow perfusion areas (left side arrow), and regions that were not visualized were categorized as low perfusion areas (right side arrow). Vascular territories with rapid, slow, and low perfusion areas were identified about 15–60 s after injection. We defined rapid or slow perfusion areas as sufficient perfusion areas and low perfusion areas as insufficient perfusion areas